DB3818 Rev 1

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L9370

Block diagram and pin description

13

Table 2. Pin definition and brief function description

Pin #

Symbol

Function

I/O type

1

SYS_WAKE_IN /

(GPIO1) / (MSM_A)

SYS_WAKE_IN is a GPIO (General Purpose Programmable

input/output) configured by default as digital input for system

wake-up trigger in Sleep mode only. Configuration is stored in

PROM. (This function needs the SYS_WAKE as companion

function to work properly, as SYS_WAKE_IN (feedback from ext

network) is managed by logic to provide wake-up output pulse

to System basis chip (SBC) during sleep mode (WAU=low).

MSM_A is disabled due to pin sharing with GPIO block).

GPIO1 = General Purpose Programmable input/output pin.

After the 1st start-up SYS_WAKE_IN can be disabled via SPI in

case not requested by application.

MSM_A = Return pin for the motor speed sensor of stage A with

monitoring and short-circuit protection. (SYS_WAKE_IN and

GPIO1 functionalities are disabled)

I/O

2

GPIO0 / MSP_A (FAULT

PIN)

GPIO0 = General Purpose Programmable input/output pin

MSP_A = Supply pin for the motor speed sensor of stage A with

monitoring short to GND protection and reverse supply

protection

(GPIO0 can be configured as Fault pin with programmable fault

set via SPI and storage in PROM).

I/O

3

GPIO2/MSP_B

GPIO2 = General Purpose Programmable input/output pin

MSP_B = Supply pin for the motor speed sensor of stage B with

monitoring short to GND protection and reverse supply

protection

I/O

4

GPIO3/MSM_B

GPIO3 = General Purpose Programmable input/output pin

MSM_B = Return pin for the motor speed sensor of stage B with

monitoring and short-circuit protection

I/O

5

CL1

Low connection of the stage 1 external pump capacitor

I

6

CH1

High connection of the stage 1external pump capacitor

I

7

CL2

Low connection of the stage 2 external pump capacitor

I

8

CH2

High connection of the stage 2 external pump capacitor

I

9

CP

Charge pump output voltage

O

10

VSCP

Charge pump supply voltage with monitoring

I

11

VBP

Battery supply and redundant supply for charge pump

stage.(Due to PROM data loss, configuration is lost if

VBP<VBPpermanent)

I

12

VSBRIDGE_A

Drain connection of the external H-Bridge High-side NFET and

measurement input for H-bridge supply voltage (stage A)

I

13

VSBRIDGE_B

Drain connection of the external H-Bridge High-side NFET and

measurement input for H-bridge supply voltage (stage B)

I

14

CSIN1M_B

Negative input pin of the external shunt #1 connected to CSA

stage B

I