Data Sheet

ICM-20948
Document Number: DS-000189 Page 74 of 89
Revision: 1.3
11.17 I2C_SLV3_REG
Name: I2C_SLV3_REG
Address: 16 (10h)
Type: USR3
Bank: 3
Serial IF: R/W
Reset Value: 0x00
BIT
NAME
FUNCTION
7:0
I2C_SLV3_REG[7:0]
I
2
C slave 3 register address from where to begin data transfer.
11.18 I2C_SLV3_CTRL
Name: I2C_SLV3_CTRL
Address: 17 (11h)
Type: USR3
Bank: 3
Serial IF: R/W
Reset Value: 0x00
BIT NAME FUNCTION
7
I2C_SLV3_EN
1 – Enable reading data from this slave at the sample rate and storing data at the first
available EXT_SENS_DATA register as determined by I2C_SLV0_EN, I2C_SLV0_LENG,
I2C_SLV1_EN, I2C_SLV1_LENG, I2C_SLV2_EN and I2C_SLV2_LENG.
0 – Function is disabled for this slave.
6
I2C_SLV3_BYTE_SW
1 – Swap bytes when reading both the low and high byte of a word. Note there is
nothing to swap after reading the first byte if I2C_SLV3_REG[0] = 1, or if the last byte
read has a register address lsb = 0.
See I2C_SLV1_CTRL for an example.
0 – No swapping occurs, bytes are written in order read.
5
I2C_SLV3_REG_DIS
When set, the transaction does not write a register value, it will only read data, or
write data.
4
I2C_SLV3_GRP
External sensor data typically comes in as groups of two bytes. This bit is used to
determine if the groups are from the slave’s register address 0 and 1, 2 and 3, etc..,
or if the groups are address 1 and 2, 3 and 4, etc.
0 indicates slave register addresses 0 and 1 are grouped together (odd numbered
register ends the group). 1 indicates slave register addresses 1 and 2 are grouped
together (even numbered register ends the group). This allows byte swapping of
registers that are grouped starting at any address.
3:0
I2C_SLV3_LENG[3:0]
Number of bytes to be read from I
2
C slave 3.
11.19 I2C_SLV3_DO
Name: I2C_SLV3_DO
Address: 18 (12h)
Type: USR3
Bank: 3
Serial IF: R/W
Reset Value: 0x00
BIT
NAME
FUNCTION
7:0
I2C_SLV3_DO[7:0]
Data out when slave 3 is set to write.