Functional description

L9826

14/19

Doc ID 7214 Rev 10

5.3

Output stage diagnostics

All the outputs voltage are compared with the diagnostic threshold (0.38 Typ · VCC) and this

information is transferred in dedicated fault latches which are cleared when the NCS

reaches the state low. Afterward the latch stores the status bit and the first reading after the

error might be wrong. The second one is considered right.

The next Figure 7 and 8 show the diagnostic bits read out on SDO and their organization

into the dedicated registers.

When NCS is low the data contained in the shift register are transferred to SDO output every

CLK rising edge.

Figure 7.

The pulse diagram to read the outputs status register

Figure 8.

The structure of the outputs status register