L9680 datasheet(216/277 Pages) STMICROELECTRONICS

Part #	L9680

Description	Automotive advanced airbag IC for mid/high end applications

PDF	277 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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216 / 277 page

System voltage diagnostics

L9680

216/277

DocID029257 Rev 1

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 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)

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

6543210

MOSI

xxxxxx

x x x

ADCREQ_A[6:0]

MISO NEWDATA_A

ADCREQ_A[6:0]

ADCRES_A[9:0]

L9680 Datasheet(PDF) 216 Page - STMicroelectronics