TIC10024-Q1 Datasheet, PDF (46/81 Pages) Texas Instruments – 24-Input Multiple Switch Detection Interface (MSDI) Device With Adjustable Wetting Current for Automotive Systems

TIC10024-Q1
SCPS268 – SEPTEMBER 2017
www.ti.com
Table 12. CONFIG Register Field Descriptions (continued)
Bit
Field
11
TRIGGER
10
POLL_EN
9
CRC_T
8-5
POLL_ACT_TIME
Type
R/W
R/W
R/W
R/W
Reset
0h
0h
0h
0h
Description
When the TRIGGER bit is set to logic 1, normal device operation
(wetting current activation and polling) starts. To stop device
operation and keep the device in an idle state, de-assert this bit to 0.
After device normal operation is triggered, if at any time the device
setting needs to be re-configured, the microcontroller is required to
first set the bit TRIGGER to logic 0 to stop device operation. Once
the re-configuration is completed, the microcontroller can set the
TRIGGER bit back to logic 1 to re-start device operation. If re-
configuration is done on the fly without first stopping the device
operation, false switch status could be reported and accidental
interrupt might be issued. The following register bits are the
exception and can be configured when TRIGGER bit is set to logic 1:
– TRIGGER (bit 11 of the CONFIG register)
– CRC_T (bit 9 of the CONFIG register)
– RESET (bit 0 of the CONFIG register)
– The CCP_CFG1 register
0h = Stop TIC10024-Q1 from normal operation.
1h = Trigger TIC10024-Q1 normal operation
0h = Polling disabled. Device operates in continuous mode.
1h = Polling enabled and the device operates in one of the polling
modes.
Set this bit to 1 to trigger a CRC calculation on all the configuration
register bits. Once triggered, it is strongly recommended the SPI
master does not change the content of the configuration registers
until the CRC calculation is completed to avoid erroneous CRC
calculation result. The TIC10024-Q1 sets the CRC_CALC interrupt
bit and asserts the INT pin low when the CRC calculation is
completed. The calculated result will be available in the CRC
register. This bit self-clears back to 0 after CRC calculation is
executed.
0h = no CRC calculation triggered
1h = trigger CRC calculation
0h = 64μs
1h = 128μs
2h = 192μs
3h = 256μs
4h = 320μs
5h = 384μs
6h = 448μs
7h = 512μs
8h = 640μs
9h = 768μs
Ah = 896μs
Bh = 1024μs
Ch = 2048μs
Dh-15h = 512μs (most frequently-used setting)
46
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