L9678P datasheet(158/203 Pages) STMICROELECTRONICS

158 / 203 page

System voltage diagnostics

L9678P, L9678P-S

158/203

DocID029274 Rev 3

System voltage diagnostics

L9678P 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. 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 11: Diagnostics control register (DIAGCTRLx) on page 159.

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

DIAGCTRL_A (ADDRESS HEX 3A)

DIAGCTRL_B (ADDRESS HEX 3B)

DIAGCTRL_C (ADDRESS HEX 3C)

DIAGCTRL_D (ADDRESS HEX 3D)

ADCREQ[A-D] bit fields, used to address the different measurements offered, are listed in

Table 11: Diagnostics control register (DIAGCTRLx) on page 159 for reference.

L9678P diagnostics are structured to take four automatic conversions at a time. In order to

get four measurements, four different SPI commands have to be sent (DIAGCTRL_A,

DIAGCTRL_B, DIAGCTRL_C and DIAGCTRL_D), in no particular order.

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

654

3210

MOSI

xxxx

x x x

ADCREQ_A[6:0]

MISO NEWDATA_A

ADCREQ_A[6:0]

ADCRES_A[9:0]

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

MOSI

x x x

ADCREQ_B [6:0]

MISO NEWDATA_B

ADCREQ_B [6:0]

ADCRES_B [9:0]

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

MOSI

x x x

ADCREQ_C [6:0]

MISO NEWDATA_C

ADCREQ_C [6:0]

ADCRES_C [9:0]

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

654

3210

MOSI

xxxxxx

x x x

ADCREQ_D [6:0]

MISO NEWDATA_D

ADCREQ_D [6:0]

ADCRES_D [9:0]

L9678P Datasheet(PDF) 158 Page - STMicroelectronics

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