SBAS813 June 2018 ADS8688AT
PRODUCTION DATA.
The command register is a 16-bit, write-only register that is used to set the operating modes of the ADS8688AT. The settings in this register are used to select the channel sequencing mode (AUTO_RST or MAN_Ch_n), configure the device in standby (STDBY) or power-down (PWR_DN) mode, and reset (RST) the program registers to their default values. Table 7 lists all command settings for this register. During power-up or reset, the default content of the command register is all 0's and the device waits for a command to be written before being placed into any mode of operation. See Figure 1 for a typical timing diagram for writing a 16-bit command into the device. The device executes the command at the end of this particular data frame when the CS signal goes high.
REGISTER | MSB BYTE | LSB BYTE | COMMAND
(Hex) |
OPERATION IN NEXT FRAME | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|
B15 | B14 | B13 | B12 | B11 | B10 | B9 | B8 | B[7:0] | |||
Continued Operation
(NO_OP) |
0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0000 0000 | 0000h | Continue operation in previous mode |
Standby
(STDBY) |
1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0000 0000 | 8200h | Device is placed into standby mode |
Power Down
(PWR_DN) |
1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0000 0000 | 8300h | Device is powered down |
Reset Program Registers
(RST) |
1 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0000 0000 | 8500h | Program register is reset to default |
Auto Ch. Sequence With Reset
(AUTO_RST) |
1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0000 0000 | A000h | Auto mode enabled following a reset |
Manual Ch 0 Selection
(MAN_Ch_0) |
1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0000 0000 | C000h | Channel 0 input is selected |
Manual Ch 1 Selection
(MAN_Ch_1) |
1 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0000 0000 | C400h | Channel 1 input is selected |
Manual Ch 2 Selection
(MAN_Ch_2) |
1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0000 0000 | C800h | Channel 2 input is selected |
Manual Ch 3 Selection
(MAN_Ch_3) |
1 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 0000 0000 | CC00h | Channel 3 input is selected |
Manual Ch 4 Selection
(MAN_Ch_4) |
1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0000 0000 | D000h | Channel 4 input is selected |
Manual Ch 5 Selection
(MAN_Ch_5) |
1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 0000 0000 | D400h | Channel 5 input is selected |
Manual Ch 6 Selection
(MAN_Ch_6) |
1 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0000 0000 | D800h | Channel 6 input is selected |
Manual Ch 7 Selection
(MAN_Ch_7) |
1 | 1 | 0 | 1 | 1 | 1 | 0 | 0 | 0000 0000 | DC00h | Channel 7 input is selected |
Manual AUX Selection
(MAN_AUX) |
1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0000 0000 | E000h | AUX channel input is selected |