L99UDL01 datasheet(82/88 Pages) STMICROELECTRONICS

82 / 88 page

Programmers guide

L99UDL01

82/88

DS12511 Rev 5

TWx

These bits indicate which outputs have temperatures over the thermal warning threshold

(TW). They will remain set as long as the junction temperature is above the thermal warning

reset threshold (TW_RES). Once the junction temperature is below the thermal warning reset

threshold they can only be cleared by a Read & Clear command.

TSDx

These bits indicate which outputs have exceeded the over temperature shutdown threshold.

There are two reactions to a thermal shutdown. The individual output can be disabled or the

entire IC can be disabled by setting TSD_ACT bit to 1 (Register 03H).

The TSDx bits will remain set as long as the junction temperature is above the thermal

shutdown reset threshold (TSD_RES). Once the junction temperature is below the thermal

shutdown reset threshold they can only be cleared by a Read & Clear command.

Offending outputs will remain latched off until their respective TSDX bits are Read &

Cleared.

VSOV

VS overvoltage bit is set when the device has exceeded the VSOVSD threshold

VSLVI

VS under voltage inhibit bit is set when the VS voltage has dropped below the VSLVI_F

threshold.

CPLOW

CPLOW will remain set indicating that the charge pump was low, below VCPLOW threshold.

When CPLOW is set (i.e. the Charge Pump is low), the EXTFx_y bits (in register 11H) and

the FLTx_y bits (in register 10H) may be set too.

6.3.5

TW1

Thermal Warning Out 1

Cleared

0 LSB

Parity

Parity bit

Table 57. 12H register bit description (continued)

Bit No.

Function

Level

State after SPI

Read & Clear

Default

(after POR)

Figure 30. 13H through 18H Regulated current feedback registers

OC1

OC2

D 15 D 14 D 13 D 12 D 11 D 10

D 9

D 8

D 7

D 6

D 5

D 4

D 3D 2

D 1D 0

Default Values

0000000000

00000

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