L9680 datasheet(219/286 Pages) STMICROELECTRONICS

Part #	L9680

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

PDF	286 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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219 / 286 page

DS11615 Rev 7

219/286

L9680

System voltage diagnostics

285

System voltage diagnostics

L9680 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 69. 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)

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]

GAPG2104161155PS

L9680 Datasheet(PDF) 219 Page - STMicroelectronics