AIS2120SX datasheet(46/58 Pages) STMICROELECTRONICS

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Interface description

AIS1120SX / AIS2120SX

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DocID028312 Rev 3

Table 43 provides some examples of SDO bit sequence interpretation.

Notes:

1.Once the device finishes fast offset cancellation (and self-test calibration), it automatically

enters into the programming phase (ST1:ST0 status "10") until the EOI command has been

sent. During this phase, if there is not any self-test initialization command from SPI, 0 g in

self-test phase on both channels could be read from the acceleration commands.

2.When starting channel X self-test:

a.Channel X acceleration command will read channel X self-test value

b.Channel Y acceleration command will read temperature sensor value for self-test

temperature compensation algorithm.

3.When starting channel Y self-test:

c.Channel X acceleration command will read temperature sensor value for self-test

temperature compensation algorithm.

d.Channel Y acceleration command will read channel Y self-test value

CNC = 0100 condition not correct error

ND = 0101 no data error

HE = 0110 (cap loss error + charge pump error + VDD undervoltage +

VREG undervoltage + VDD overvoltage + VREG overvoltage + SLOW

offset max)

AS = 1000 (ADC internal > 160G)

Table 43. SDO bit examples

[25:12]

[11:8]

[7:0]

Definition

SEN

CH1

CH0

ST1

ST2

D11:D2/error

SF3:SF0

CRC

Device status

X, Init no ST

0101

CRC

INIT, self test off

Y, Init no ST

0101

CRC

INIT, self test off

X data

0000

CRC

Normal mode

Y data

0000

CRC

Normal mode

X data

0000

CRC

Self-test mode

Y data

0000

CRC

Self-test mode

X data

Status flag

CRC

Error response

Y data

Status flag

CRC

Error response

Table 42. Error codes (continued)

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