LNBH26 datasheet(11/38 Pages) STMICROELECTRONICS

11 / 38 page

LNBH26

Application information (valid for each section A/B)

Doc ID 022771 Rev 1

11/38

If OLR=0, the involved output is automatically re-enabled as soon as the overload condition

is removed, and the OLF bit is reset to “0” after a register reading operation.

2.21

OTF: thermal protection and diagnostic

The LNBH26 is also protected against overheating: when the junction temperature exceeds

150 °C (typ.), the step-up converter and both liner regulators are shut off, the diagnostic

OTF bit in the STATUS1 register is set to “1” and the FLT pin is set to low level. After the

overtemperature condition is removed, normal operation can be resumed in two ways,

according to the THERM I²C bit on the DATA4 register.

If THERM=1, all VSEL bits are reset to “0” and both LNB outputs (VOUT pins) are disabled.

To re-enable output stages, the VSEL bits must be set again by the microprocessor, while

the OTF bit is reset to “0” after a register reading operation.

If THERM=0, outputs are automatically re-enabled as soon as the overtemperature

condition is removed, while the OTF bit is reset to “0” after a register reading operation.

LNBH26 Datasheet(PDF) 11 Page - STMicroelectronics