L99PD08 datasheet(9/41 Pages) STMICROELECTRONICS

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L99PD08

Pin definitions and functions

Doc ID 15872 Rev 3

9/41

The output PWM period is a factor of 256 of the frequency applied on CLK_INx signal.

If the external clock signal is not available or is below fPWM(min) , the device will fallback to an

internal PWM frequency generator fPWM of approximately 122Hz periode.

2.3

LHOMEN

This pin allows connecting the output pull-down resistor for LIMP HOME mode. This pin is

pulled to VDDIO in normal mode and is pulled low in case of failure (RESET and FAIL SAVE

mode).

If power supply VDDIO is not connected, LHOMEN becomes weak low (LIMP HOME

mode).

2.4

Output 0 to 7 (OUT0 … OUT7)

True open drain outputs are used to drive the High Side Driver inputs. These lines must

have a pull-up resistor connected either to a separate supply or LHOMEN signal if LIMP

HOME is supported.

These outputs are high impedance during RESET, Fail Safe modes and during SW Reset.

2.5

Status/current sense inputs (ST0/CS0 … ST7/CS7)

Those inputs are used to take the status or current sense information from DIGITAL or

ANALOG HSD and provide information to the internal diagnosis. Every output has to

correspond to the same HSD channel like the ST/CS input (OUT0 with ST0/CS0, OUT1 with

ST1/CS1, …). Status of digital channels have to have an external pull-up resistor

(4.7 kOhm) and a series protection resistor of 4.7 kOhm to STx/CSx, current sense signals

of analog channels have to be connected to STx/CSx pins through a 100 Ohm reverse

battery protection resistor.

The HSD type which is connected to the device (digital or analog) must be selected through

the register DEV_TYPE (Addr: hex02).

2.6

Multiplexed status/current sense output (MUX_ST/CS)

The MUX_ST/CS Pin reflects the status or current sense information corresponding to the

channel selected in the control register bits MUX_EN, MUX_A, B, C (Addr: hex00; Bit 7-4).

This pin delivers up to 3 mA at 2.7 V. It is recommended to use a 1.6k to 2.7kOhm external

resistor to ground for the maximum dynamic range. The best choice for the external resistor

depends on the Rdson class of the analog current sense HSD and of the loads.

If the multiplexer is disabled the MUX_ST/CS pin is in tristate condition.

2.7

VDDIO, VCORE3

The digital voltage supply of the device is internally limited to 3.3 V. In order to support also

the 5 V supply voltages a linear internal voltage regulator can be used.

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