Low-power comparator (LPCOMP) compares an input voltage against a reference voltage.
Listed here are the main features of LPCOMP:
In System ON, the LPCOMP can generate separate events on rising and falling edges of a signal, or sample the current state of the pin as being above or below the selected reference. The block can be configured to use any of the analog inputs on the device. Additionally, the low-power comparator can be used as an analog wakeup source from System OFF or System ON. The comparator threshold can be programmed to a range of fractions of the supply voltage.
The wakeup comparator (LPCOMP) compares an input voltage (VIN+), which comes from an analog input pin selected via the PSEL register, against a reference voltage (VIN-) selected via registers REFSEL and EXTREFSEL.
The PSEL, REFSEL, and EXTREFSEL registers must be configured before the LPCOMP is enabled through the ENABLE register.
The HYST register allows enabling an optional hysteresis in the comparator core. This hysteresis shall prevent noise on the signal to create unwanted events. Figure below illustrates the effect of an active hysteresis on a noisy input signal. It is disabled by default, and shall be configured before enabling LPCOMP as well.
The LPCOMP is started by triggering the START task. After a startup time of tLPCOMP,STARTUP, the LPCOMP will generate a READY event to indicate that the comparator is ready to use and the output of the LPCOMP is correct. The LPCOMP will generate events every time VIN+ crosses VIN-. More specifically, every time VIN+ rises above VIN- (upward crossing) an UP event is generated along with a CROSS event. Every time VIN+ falls below VIN- (downward crossing), a DOWN event is generated along with a CROSS event. When hysteresis is enabled, the upward crossing level becomes (VIN- + VHYST/2), and the downward crossing level becomes (VIN- - VHYST/2).
The LPCOMP is stopped by triggering the STOP task.
LPCOMP will be operational in both System ON and System OFF mode when it is enabled through the ENABLE register. See POWER — Power supply for more information about power modes. Note that it is not allowed to go to System OFF when a READY event is pending to be generated.
All LPCOMP registers, including ENABLE, are classified as retained registers when the LPCOMP is enabled. However, when the device wakes up from System OFF, all LPCOMP registers will be reset.
The LPCOMP can wake up the system from System OFF by asserting the ANADETECT signal. The ANADETECT signal can be derived from any of the event sources that generate the UP, DOWN and CROSS events. In case of wakeup from System OFF, no events will be generated, only the ANADETECT signal. See the ANADETECT register (ANADETECT) for more information on how to configure the ANADETECT signal.
The immediate value of the LPCOMP can be sampled to RESULT by triggering the SAMPLE task.
See RESETREAS for more information on how to detect a wakeup from LPCOMP.
The LPCOMP shares analog resources with SAADC. While it is possible to use the SAADC at the same time as the LPCOMP, selecting the same analog input pin for both modules is not supported.
Additionally, LPCOMP shares registers and other resources with other peripherals that have the same ID as the LPCOMP. See Peripherals with shared ID for more information.
The LPCOMP peripheral shall not be disabled (by writing to the ENABLE register) before the peripheral has been stopped. Failing to do so may result in unpredictable behavior.
You can use the LPCOMP.PSEL register to select one of the analog input pins, AIN0 through AIN7, as the analog input pin for the LPCOMP.
See GPIO — General purpose input/output for more information about the pins. Similarly, you can use EXTREFSEL to select one of the analog reference input pins, AIN0 and AIN1, as input for AREF in case AREF is selected in EXTREFSEL. The selected analog pins will be acquired by the LPCOMP when it is enabled through ENABLE.
Base address | Peripheral | Instance | Description | Configuration | |
---|---|---|---|---|---|
0x40013000 | LPCOMP | LPCOMP |
Low power comparator |
Register | Offset | Description | |
---|---|---|---|
TASKS_START | 0x000 |
Start comparator |
|
TASKS_STOP | 0x004 |
Stop comparator |
|
TASKS_SAMPLE | 0x008 |
Sample comparator value |
|
EVENTS_READY | 0x100 |
LPCOMP is ready and output is valid |
|
EVENTS_DOWN | 0x104 |
Downward crossing |
|
EVENTS_UP | 0x108 |
Upward crossing |
|
EVENTS_CROSS | 0x10C |
Downward or upward crossing |
|
SHORTS | 0x200 |
Shortcuts between local events and tasks |
|
INTENSET | 0x304 |
Enable interrupt |
|
INTENCLR | 0x308 |
Disable interrupt |
|
RESULT | 0x400 |
Compare result |
|
ENABLE | 0x500 |
Enable LPCOMP |
|
PSEL | 0x504 |
Input pin select |
|
REFSEL | 0x508 |
Reference select |
|
EXTREFSEL | 0x50C |
External reference select |
|
ANADETECT | 0x520 |
Analog detect configuration |
|
HYST | 0x538 |
Comparator hysteresis enable |
Address offset: 0x000
Start comparator
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | A | ||||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | W |
TASKS_START |
Start comparator |
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Trigger |
1 |
Trigger task |
Address offset: 0x004
Stop comparator
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | A | ||||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | W |
TASKS_STOP |
Stop comparator |
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Trigger |
1 |
Trigger task |
Address offset: 0x008
Sample comparator value
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | A | ||||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | W |
TASKS_SAMPLE |
Sample comparator value |
||||||||||||||||||||||||||||||||
Trigger |
1 |
Trigger task |
Address offset: 0x100
LPCOMP is ready and output is valid
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | A | ||||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
EVENTS_READY |
LPCOMP is ready and output is valid |
||||||||||||||||||||||||||||||||
NotGenerated |
0 |
Event not generated |
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Generated |
1 |
Event generated |
Address offset: 0x104
Downward crossing
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | A | ||||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
EVENTS_DOWN |
Downward crossing |
||||||||||||||||||||||||||||||||
NotGenerated |
0 |
Event not generated |
|||||||||||||||||||||||||||||||||
Generated |
1 |
Event generated |
Address offset: 0x108
Upward crossing
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | A | ||||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
EVENTS_UP |
Upward crossing |
||||||||||||||||||||||||||||||||
NotGenerated |
0 |
Event not generated |
|||||||||||||||||||||||||||||||||
Generated |
1 |
Event generated |
Address offset: 0x10C
Downward or upward crossing
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | A | ||||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
EVENTS_CROSS |
Downward or upward crossing |
||||||||||||||||||||||||||||||||
NotGenerated |
0 |
Event not generated |
|||||||||||||||||||||||||||||||||
Generated |
1 |
Event generated |
Address offset: 0x200
Shortcuts between local events and tasks
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | E | D | C | B | A | ||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
READY_SAMPLE |
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Disabled |
0 |
Disable shortcut |
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Enabled |
1 |
Enable shortcut |
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B | RW |
READY_STOP |
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Disabled |
0 |
Disable shortcut |
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Enabled |
1 |
Enable shortcut |
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C | RW |
DOWN_STOP |
|||||||||||||||||||||||||||||||||
Disabled |
0 |
Disable shortcut |
|||||||||||||||||||||||||||||||||
Enabled |
1 |
Enable shortcut |
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D | RW |
UP_STOP |
|||||||||||||||||||||||||||||||||
Disabled |
0 |
Disable shortcut |
|||||||||||||||||||||||||||||||||
Enabled |
1 |
Enable shortcut |
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E | RW |
CROSS_STOP |
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Disabled |
0 |
Disable shortcut |
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Enabled |
1 |
Enable shortcut |
Address offset: 0x304
Enable interrupt
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | D | C | B | A | |||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
READY |
Write '1' to enable interrupt for event READY |
||||||||||||||||||||||||||||||||
Set |
1 |
Enable |
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Disabled |
0 |
Read: Disabled |
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Enabled |
1 |
Read: Enabled |
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B | RW |
DOWN |
Write '1' to enable interrupt for event DOWN |
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Set |
1 |
Enable |
|||||||||||||||||||||||||||||||||
Disabled |
0 |
Read: Disabled |
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Enabled |
1 |
Read: Enabled |
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C | RW |
UP |
Write '1' to enable interrupt for event UP |
||||||||||||||||||||||||||||||||
Set |
1 |
Enable |
|||||||||||||||||||||||||||||||||
Disabled |
0 |
Read: Disabled |
|||||||||||||||||||||||||||||||||
Enabled |
1 |
Read: Enabled |
|||||||||||||||||||||||||||||||||
D | RW |
CROSS |
Write '1' to enable interrupt for event CROSS |
||||||||||||||||||||||||||||||||
Set |
1 |
Enable |
|||||||||||||||||||||||||||||||||
Disabled |
0 |
Read: Disabled |
|||||||||||||||||||||||||||||||||
Enabled |
1 |
Read: Enabled |
Address offset: 0x308
Disable interrupt
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | D | C | B | A | |||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
READY |
Write '1' to disable interrupt for event READY |
||||||||||||||||||||||||||||||||
Clear |
1 |
Disable |
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Disabled |
0 |
Read: Disabled |
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Enabled |
1 |
Read: Enabled |
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B | RW |
DOWN |
Write '1' to disable interrupt for event DOWN |
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Clear |
1 |
Disable |
|||||||||||||||||||||||||||||||||
Disabled |
0 |
Read: Disabled |
|||||||||||||||||||||||||||||||||
Enabled |
1 |
Read: Enabled |
|||||||||||||||||||||||||||||||||
C | RW |
UP |
Write '1' to disable interrupt for event UP |
||||||||||||||||||||||||||||||||
Clear |
1 |
Disable |
|||||||||||||||||||||||||||||||||
Disabled |
0 |
Read: Disabled |
|||||||||||||||||||||||||||||||||
Enabled |
1 |
Read: Enabled |
|||||||||||||||||||||||||||||||||
D | RW |
CROSS |
Write '1' to disable interrupt for event CROSS |
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Clear |
1 |
Disable |
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Disabled |
0 |
Read: Disabled |
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Enabled |
1 |
Read: Enabled |
Address offset: 0x400
Compare result
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | A | ||||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | R |
RESULT |
Result of last compare. Decision point SAMPLE task. |
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Below |
0 |
Input voltage is below the reference threshold (VIN+ < VIN-) |
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Above |
1 |
Input voltage is above the reference threshold (VIN+ > VIN-) |
Address offset: 0x500
Enable LPCOMP
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | A | A | |||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
ENABLE |
Enable or disable LPCOMP |
||||||||||||||||||||||||||||||||
Disabled |
0 |
Disable |
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Enabled |
1 |
Enable |
Address offset: 0x504
Input pin select
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | A | A | A | ||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
PSEL |
Analog pin select |
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AnalogInput0 |
0 |
AIN0 selected as analog input |
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AnalogInput1 |
1 |
AIN1 selected as analog input |
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AnalogInput2 |
2 |
AIN2 selected as analog input |
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AnalogInput3 |
3 |
AIN3 selected as analog input |
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AnalogInput4 |
4 |
AIN4 selected as analog input |
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AnalogInput5 |
5 |
AIN5 selected as analog input |
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AnalogInput6 |
6 |
AIN6 selected as analog input |
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AnalogInput7 |
7 |
AIN7 selected as analog input |
Address offset: 0x508
Reference select
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ID | A | A | A | A | |||||||||||||||||||||||||||||||
Reset 0x00000004 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
REFSEL |
Reference select |
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Ref1_8Vdd |
0 |
VDD * 1/8 selected as reference |
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Ref2_8Vdd |
1 |
VDD * 2/8 selected as reference |
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Ref3_8Vdd |
2 |
VDD * 3/8 selected as reference |
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Ref4_8Vdd |
3 |
VDD * 4/8 selected as reference |
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Ref5_8Vdd |
4 |
VDD * 5/8 selected as reference |
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Ref6_8Vdd |
5 |
VDD * 6/8 selected as reference |
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Ref7_8Vdd |
6 |
VDD * 7/8 selected as reference |
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ARef |
7 |
External analog reference selected |
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Ref1_16Vdd |
8 |
VDD * 1/16 selected as reference |
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Ref3_16Vdd |
9 |
VDD * 3/16 selected as reference |
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Ref5_16Vdd |
10 |
VDD * 5/16 selected as reference |
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Ref7_16Vdd |
11 |
VDD * 7/16 selected as reference |
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Ref9_16Vdd |
12 |
VDD * 9/16 selected as reference |
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Ref11_16Vdd |
13 |
VDD * 11/16 selected as reference |
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Ref13_16Vdd |
14 |
VDD * 13/16 selected as reference |
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Ref15_16Vdd |
15 |
VDD * 15/16 selected as reference |
Address offset: 0x50C
External reference select
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
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ID | A | ||||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
EXTREFSEL |
External analog reference select |
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AnalogReference0 |
0 |
Use AIN0 as external analog reference |
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AnalogReference1 |
1 |
Use AIN1 as external analog reference |
Address offset: 0x520
Analog detect configuration
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
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ID | A | A | |||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
ANADETECT |
Analog detect configuration |
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Cross |
0 |
Generate ANADETECT on crossing, both upward crossing and downward crossing |
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Up |
1 |
Generate ANADETECT on upward crossing only |
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Down |
2 |
Generate ANADETECT on downward crossing only |
Address offset: 0x538
Comparator hysteresis enable
Bit number | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
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ID | A | ||||||||||||||||||||||||||||||||||
Reset 0x00000000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||
ID | Access | Field | Value ID | Value | Description | ||||||||||||||||||||||||||||||
A | RW |
HYST |
Comparator hysteresis enable |
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Disabled |
0 |
Comparator hysteresis disabled |
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Enabled |
1 |
Comparator hysteresis enabled |
Symbol | Description | Min. | Typ. | Max. | Units | ||||
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tLPCANADET |
Time from VIN crossing (>=50 mV above threshold) to ANADETECT signal generated |
5 | µs | ||||||
VINPOFFSET |
Input offset including reference ladder error |
-40 | 40 | mV | |||||
VHYST |
Optional hysteresis |
35 | mV | ||||||
tSTARTUP |
Startup time for LPCOMP |
140 | µs |