L9825 データシートの表示（PDF） - STMicroelectronics

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L9825

Octal Low-side Driver For Resistive and Inductive Loads With Serial / Parallel Input Control, Output Protection and Diagnostic

STMicroelectronics 

L9825

Fault condition 2) "open load" or "output short circuit to GND" : the output is switched off and the voltage at the

output drops below the diagnostics threshold, because the load current is lower than the output diagnostic cur-

rent source, the load is interrupted. The diagnostic bit is low.

For outputs 3 to 8 the output status signals, are fed directly to the SPI register.

Table 3. Diagnostic for outputs 1 to 8 in SPI controlled mode.

Output 1 ... 8

Output-voltage

Status-bit

off

> DG-threshold

high

off

< DG-threshold

low

on

< DG-threshold

low

on

> DG-threshold

high

Output-mode

correct operation

fault condition 2)

correct operation

fault condition 1)

The fault condition 1) "output short circuit to Vbat" :

For outputs 3 to 6 is the same as of outputs 1 and 2.

For outputs 7 and 8 : the output was switched on and the voltage at the output exceeds the diagnostics thresh-

old. The output operates in current regulation mode or has been switched off due to thermal shutdown. The sta-

tus bit is low.

Fault condition 2) "open load" or "output short circuit to GND" is the same as of outputs 1 and 2.

At the falling edge of NCS the output status data are transferred to the shift register. When NSC is low, data bits

contained in the shift register are transferred to SDO output et every rising CLK edge.

Figure 3. The Pulse Diagram to Read the Outputs Status Register

NCS

CLK

SDI

SDO

MSB 6 5 4 3 2 1 LSB

MSB 6 5 4 3 2 1 LSB

Figure 4. The Structure of the Outputs Status Register

MSB

LSB

Diag2 Diag4 Diag6 Diag8 Diag1 Diag3 Diag5 Diag7

Diagnostic-bit output 7

Diagnostic-bit output 5

Diagnostic-bit output 3

Diagnostic-bit output 1

Diagnostic-bit output 8

Diagnostic-bit output 6

Diagnostic-bit output 4

Diagnostic-bit output 2

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