L99LD02 datasheet(38/66 Pages) STMICROELECTRONICS

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Serial peripheral interface (ST SPI standard)

L99LD02

38/66

DS12448 Rev 3

CR#2: Control Register

Address:

0x02h

Type:

R/W

98765432

BST_SLP_CTRL

BST_OUT

Table 23. CR#2: Control Register 2

Bit

Default

Name

Description

23÷18

Set by OTP

DEF_BST_SLP_CTRL

BST_SLP_CTRL Boost stability – Slope Compensation Control

Set by OTP

DEF_BST_DIS_OTA

BST_DIS_OTA

BST_DIS_OTA can be set to 1 only if UNLOCK = 1; trying

to set this bit to 1 when UNLOCK = 0 will have no effects

and it will maintain its previous value.

BST_DIS_OTA can be reset to 0 also when UNLOCK = 0.

To disable Boost it is necessary to send two consecutive

SPI frames as follows:

1st SPI Register write: set UNLOCK bit to 1

2nd SPI Register write: set BST_DIS_OTA to dedicate

value;

Unused

15÷14

Set by OTP

DEF_BST_GM_OTA

BST_GM_OTA

Boost OTA gain shall be configurable in four steps:

11 --> typ. 800µS

10 --> typ. 600µS

01 --> typ. 400µS

00 --> typ. 200µS

13÷ 12

Set by OTP

DEF_BST_OCP_LIM

BST_OCP_LIM

Boost OCP limiter

The maximum drop voltage across boost shunt resistor

shall be configurable in four steps

11 --> 150mV

10 --> 115mV

01 --> 85mV

00 --> 50mV

11 ÷ 5

Set by OTP

DEF_BST_OUT

BST_OUT

Boost Output Voltage

0000000 --> 14.7V

…

1111111 --> 80V

Each step voltage is 0.51V

Unused

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