AN4650 datasheet(59/102 Pages) STMICROELECTRONICS

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AN4650

Mode 2 - sensor hub mode

102



Slave0_reg[7:0] bits are used to indicate the address of the register of the first external

sensor to be written (if the rw_0 bit of the SLV0_ADD register is set to 0) or the address

of the first register to be read (if the rw_0 bit of the SLV0_ADD register is set to 1).



Slave0_rate[1:0] bits are used to define the decimation factor applied to read

operations on the first external sensor starting from the sensor hub trigger:

–

00: no decimation

–

01: update every 2 sensor hub trigger events

–

10: update every 4 sensor hub trigger events

–

11: update every 8 sensor hub trigger events



Aux_sens_on[1:0] bits have to be used to indicate the number of external sensors to be

managed by the sensor hub:

–

00: one external sensor

–

01: two external sensors

–

10: three external sensors

–

11: four external sensors



Src_mode bit enables/disabled Source Mode conditioned reading. When this bit is set

to 1, Source Mode conditioned reading is enabled; before proceeding with the reading

of the register address indicated in the SLV0_SUBADD register, the content of the

if the content is non-zero the operation continues, else the reading operation is

interrupted. Source Mode conditioned reading is available on slave 0 only.



Slave0_numop[2:0] bits are dedicated to define the number of consecutive read

operations to be performed on the first external sensor starting from the register

address indicated in the SLV0_SUBADD register.

Table 37. SLV0_SUBADD register

Slave0

_reg7

Slave0

_reg6

Slave0

_reg5

Slave0

_reg4

Slave0

_reg3

Slave0

_reg2

Slave0

_reg1

Slave0

_reg0

Table 38. SLAVE0_CONFIG register

Slave0

_rate1

Slave0

_rate0

Aux_sens_

on1

Aux_sens_

on0

Src_mode

Slave0

_numop2

Slave0

_numop1

Slave0

_numop0

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