33912 datasheet(23/47 Pages) FREESCALE

23 / 47 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33912

FUNCTIONAL DESCRIPTION

FUNCTIONAL PIN DESCRIPTION

VOLTAGE SENSE PIN (VSENSE)

This input can be connected directly to the battery line. It

is protected against battery reverse connection. The voltage

present in this input is scaled down by an internal voltage

divider, and can be routed to the ADOUT0 output pin and

used by the MCU to read the battery voltage.

The ESD structure on this pin allows for excursion up to

+40V and down to -27V, allowing this pin to be connected

directly to the battery line. It is strongly recommended to

connect a 10kohm resistor in series with this pin for protection

purposes.

HALL SENSOR SWITCHABLE SUPPLY PIN (HVDD)

This pin provides a switchable supply for external hall

sensors. While in Normal Mode, this current limited output

can be controlled through the SPI.

The HVDD pin needs to be connected to an external

capacitor to stabilize the regulated output voltage.

+5V MAIN REGULATOR OUTPUT PIN (VDD)

An external capacitor has to be placed on the VDD pin to

stabilize the regulated output voltage. The VDD pin is

intended to supply a microcontroller. The pin is current limited

against shorts to GND and over-temperature protected.

During Stop Mode, the voltage regulator does not operate

with its full drive capabilities and the output current is limited.

During Sleep Mode, the regulator output is completely shut

down.

33912 Datasheet(PDF) 23 Page - Freescale Semiconductor, Inc