L5965 datasheet(23/73 Pages) STMICROELECTRONICS

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4.2.9

ADC

The ADC included in L5965 is a function that allows the characterization of the device on an evaluation board. It is

not intended for use in application. The absence of the ADC in the application does not affect the functionality of

the PMIC or the system's safety level.

It is a 10 bit SAR ADC able to provide via SPI a digital information on internal local thermal sensors (divided in

Thermal Clusters), VBAT1 and VBAT2.

Each cluster has a dedicated thermal warning and shutdown flag and the cluster temperature can be read out by

SPI.

In case the temperature of a cluster reaches the thermal shutdown threshold, the outputs assigned to this cluster

are shut down (all other outputs remain active). Thermal shutdown is independent from the ADC.

4.2.10

Wake up pin (WKUP)

The WKUP pin has an internal pulldown resistance. The maximum voltage this pin can sustain is limited to 40 V.

A higher voltage compliance level in the application can be achieved by applying an external series resistor

between the WKUP pin and the external wake-up signal.

•

When the device is in STANDBY mode, it can be activated by a voltage above VWAKE_ON threshold, with a

minimum duration of tWAKE_FILTER.

•

The device can be moved to STANDBY mode, applying a voltage below VWAKE_OFF threshold, with a

minimum pulse width of tWAKE_FILTER.

4.2.11

Synchronizing pin (SYNC in/out)

The user can provide an external clock on SYNCIN pin (higher than 1.8 MHz) in order to change the switching

frequency of the internal regulators (Buck1,Buck2, Buck3, Buck4 and Boost).

In case an external clock is not provided, SYNCIN can be left floating (with inner pull-down resistor). All regulators

work at their default switching frequency or, for the Buck2, the frequency selected by OTP.

When a clock at fsyncin frequency is provided on SYNCIN pin:

•

Buck1 works at fsyncin/6 if fsyncin>1.8 MHz or 400 kHz (default switching frequency) if fsyncin<1.2 MHz.

•

Buck3, Buck4 and Boost work at fsyncin if fsyncin>1.8 MHz or 2.4 MHz (default switching frequency) if

fsyncin<1.2 MHz.

•

When the frequency of the Buck2 is set to 2.4 MHz by OTP, the Buck2 works at fsyncin if fsyncin>1.8 MHz or

2.4 MHz (default switching frequency) if fsyncin<1.2 MHz.

•

When frequency of the Buck2 is set to 400 kHz by OTP, the Buck2 works at fsyncin/6 if fsyncin>1.8 MHz or

400 kHz (default switching frequency) if fsyncin<1.2 MHz.

L5965

Voltage regulators and features description

DS12567 - Rev 3

page 23/73

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