L99MD01 datasheet(32/54 Pages) STMICROELECTRONICS

32 / 54 page

SPI control and status register

L99MD01

32/54

Doc ID 17242 Rev 6

Table 27.

Control register 2

Bit

Control register 2 (read/write); address 02h

Name

Comment

SMPS frequency and duty cycle.

SMPS on cycles bit 5

Number of ON cycles for SMPS driver, binary coded.

Cycles are based on the internal oscillator

If all bits are set to “1” the SMPS output is high for 63 clock cycles.

SMPS on cycles bit 4

SMPS on cycles bit 3

SMPS on cycles bit 2

SMPS on cycles bit 1

SMPS on cycles bit 0

SMPS off cycles bit 5

Number of OFF cycles for SMPS driver, binary coded.

Cycles are based on the internal Oscillator. If OFF is set to values 3 the SMPS

driver is switched off.

If all bits are set to “1” the SMPS output is low for 63 clock cycles.

SMPS off cycles bit 4

SMPS off cycles bit 3

SMPS off cycles bit 2

SMPS off cycles bit 1

SMPS off cycles bit 0

Table 28.

Control register 3

Bit

Control register 3 (read/write); address 03h

Name

Comment

High current LS 8

High current mode of low-side switch

“0”: The selected low-side switch is in low current mode. The overcurrent and

open-load thresholds are reduced by ½.

The selected current monitor ratio is doubled.

“1” (default setting) the selected low-side switch is in high current mode

High current LS 7

High current LS 6

High current LS 5

High current LS 4

High current LS 3

High current LS 2

High current LS 1

6VS OV shutdown/warn

In case of VS overvoltage

“0”: all outputs are switched off + status bit set

“1”: only status bit is set

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