L5953

SPI interface

19/31

.

.

Table 8.

Instruction set

Instruction

Description

Instruction Format

WREN

Set write enable latch

00000110

WRDI

Reset write enable latch

00000100

WSTA

Write status register

00000010

RDIA

Read diagnostic register

00000101

RSTA

Read status register

00000011

Table 9.

Status register

s15

s14

s13

s12

s11

s10

s9

s8

s7

s6

s5

s4

s3

s2

s1

s0

REG

2

HSD

1

HSD

2

TBD

TBD

PWM

freq.

PWM TBD

TBD

TBD

TBD

TBD

TBD

TBD

Test

mode

START

DIAG

Table 10.

Status register description

01

s15

REG2 linear voltage

regulator 1.5 to 3.3V

Regulator off

Regulator on

s14

High side driver 1

HSD1 off

HSD1 on

s13

High side driver 2

HSD2 off

HSD2 on

s12

TBD

s11

TBD

s10

PWM switching frequency

260kHz

400kHz

s9

PWM voltage regulator

PWM1 off

PWM1 on

s8

TBD

s7

TBD

s6

TBD

s5

TBD

s4

TBD

s3

TBD

s2

TBD

s1

Test mode

Test mode off

1.

In this case the bits s15 - s2 are internally set to 0 (regulators and high side drivers are in off condition)

s0

Diagnostic

Diagnostic off

Starts the diagnostic procedure:

- in test mode if s1=1;

- during normal operation if s1=0

If s1=0 and s0=1, must be s14 = 1

(HSD1 ON) and s13=1 (HSD2 ON)