JAJSHI3C March 2019 – October 2019 TPS23881
COMMAND = 22h with 1 Data Byte, Write Only
Used to do enable capacitance measurement from Maunal mode
|LEGEND: R/W = Read/Write; R = Read only; W = Write only; -n = value after reset|
|7, 5, 3, 1||Reserved||R/W||0|
|6, 4, 2, 0||CDETn||R/W||0||Enables Capacitance defection for channel "n"
0 = Capacitance defection disabled
1 = Capacitance detection enabled
To complete a capacitance measurement on a channel, the channel must first be placed into diagnostic mode. Set the bits in register 0x22h to enable capacitance detection on the channel(s) desired. Then set the DETE bits in register 0x14h to begin the detection and process.
The TPS23881 SRAM needs to be programmed in order for the capacitance measurement to operate properly.
The capacitance measurement is only supported in Manual/Diagnostic mode.
No capacitance measurement will be made if the result of the resistance detection is returned as "valid".
For 4P wired ports, the capacitance measurement needs to be completed on each channel individually.
Upon completion of the capacitance measurement the DETCn bit will bet in register 0x04h, and the resistance and capacitance values will be updated in registers 0x44h - 0x4Bh.