L9300 datasheet(65/178 Pages) STMICROELECTRONICS

65 / 178 page

Figure 38. Failsafe concept

GADG2012171046PS

10.2.2

Fail–safe pre–driver electrical characteristics

5.5 V ≤ VBATP ≤ 19 V; 5.5 V ≤ PD1D ≤ 19 V; -40 °C ≤ Tj ≤ 175 °C, unless otherwise noticed. All voltages refer to

GND pin.

Table 39. Fail-safe Pre-driver electrical characteristics

Symbol

Parameter

Test condition

Min Typ Max Unit

Failsafe Pre-driver

PD2_ON

PD2 ON voltage

PD2G – PD2S

PD2G, PD2S

PD2_OFF

PD2 OFF voltage

PD2G – PD2S

PD2G, PD2S

PD2_Isource

PD2 current source

0.5

1.5

PD2G

PD2_Isink

PD2 current sink

2.5

7.5

PD2G

PD2S_Ibias_OFF PD2S bias current from CP supply

Failsafe Pre-driver disabled, WAKE = VBATP

= 13V

-350 -250 -150

µA

PD2S

PD2S_Ibias_ON PD2S bias current from CP supply

FailSafe Pre-driver enabled, WAKE = VBATP

= 13V

-250 -160 -100

µA

PD2S

10.3

Pump pre-driver

10.3.1

Pump pre-driver functional description

The device provides a pump motor pre-driver channel that can operate in PWM mode. The value of switching

frequency and value of the duty cycle of the pre-driver have to be programmed by SPI using PUMP_TCK_PGM

(8bit) and PUMP_DTY_PGM (8bit) registers. The picture below shows the architecture of the PWM generation.

L9300

Valve drivers

DS12258 - Rev 5

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