L9679P datasheet(212/279 Pages) STMICROELECTRONICS

Part #	L9679P

Description	Automotive advanced airbag for mid/high end applications and cut-off battery IC

PDF	279 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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212 / 279 page

System voltage diagnostics

L9679P

212/279

DS11627 Rev 7

System voltage diagnostics

L9679P has an integrated dedicated circuitry to provide diagnostic feedback and processing

of several inputs. These inputs are addressed with an internal analog multiplexer and made

available through the SPI digital interface with the Diagnostic Data commands. In order to

avoid saturation of high voltage internal signals, an internal voltage divider is used.

Figure 68. ADC MUX

The diagnostics circuitry is activated by four SPI Diagnostics Control commands

(DIAGCTRLx); each of them can address all the available nodes to be monitored, except for

what mentioned in Table 18.

DIAGCTRLx SPI command bit fields are structured in the following way:

DIAGCTRL_A (ADDRESS HEX 3A)

GAPG2104161155PS

18 17 16 15 14 13 12 11 10 9 8 7

MOSI

x x x x

ADCREQ_A[6:0]

MISO NEWDATA_A

ADCREQ_A[6:0]

ADCRES_A[9:0]

L9679P Datasheet(PDF) 212 Page - STMicroelectronics