L9963E datasheet(22/184 Pages) STMICROELECTRONICS

22 / 184 page

L9963E pin

SPI function

Configuration

ISOLm_NCS

Chip Select (CS)

Digital input. Active low.

GPIO8_SCK

Serial Clock (SCK)

Digital input.

GPIO9_SDO

Serial Data Out (SDO)

Digital output

A 40-bit frame is used including a 6-bit CRC.

Refer to Section 4.2.4 SPI protocol details for further details about the protocol.

Table 14. SPI interface quick look

Parameter

Description

Protocol

Out of frame

Single Frame Length

40 bit

Addressable Devices

Frame protection

6 bit CRC

Max. Frequency

5 MHz

CPOL

CPHA

Master/Slave configuration

MCU Master / L9963E Slave

4.2.3

Isolated Serial Peripheral Interface

The Isolated SPI interface allows units with different ground levels and on different boards to communicate with

each other. Physically the interface is based on a twisted-pair wire with transformer isolators.

The isolated SPI pinout is listed in the following table:

Table 15. Isolated SPI pinout

SPI Function

Configuration

ISOLp_SDI

Port L positive differential input/output

Analog input/output

ISOLm_NCS

Port L negative differential input/output

Analog input/output

ISOHp

Port H positive differential input/output

Analog input/output

ISOHm

Port H negative differential input/output

Analog input/output

L9963E

Serial communication interface

DS13636 - Rev 12

page 22/184

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