FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
PROGRAMMING PIN 2 (P2)
KEEP ALIVE SUPPLY (KA_VBAT)
Programming Pin 2 for the VDD3, VDDL, and VKAM
reference voltage. The output voltage of the VDD3, VDDL
and VKAM regulators can be programmed by the P1, P2, and
P3 pins (see Table 6).
This pin is the keep alive supply input. This input is reverse
battery protected. This input supplies power to the internal
supply and bias circuits that have to do with this VKAM and
other always-on supplies.
PROGRAMMING PIN 3 (P3)
CHARGE PUMP (CP)
Programming Pin 3 for the VDD3, VDDL, and VKAM
reference voltages. The output voltage of the VDD3, VDDL
and VKAM regulators can be programmed by the P1, P2, and
P3 pins (see Table 6).
External reservoir capacitor of the internal charge pump.
This charge pump provides the voltage needed to sufficiently
enhance the gates of the internal n-channel mosfets (VREF1,
VREF2, and VDDH) during the low battery condition.
PROTECTION FET DRIVE (PFD)
KEEP ALIVE MEMORY (VKAM)
Reverse battery protection FET gate drive. This pin is an
output drive for the gate of the external Reverse Battery
Protection N-channel FET.
Keep Alive Memory (standby) supply output. This output
supplies power for the module Keep-Alive memory. This
output is always on, if the voltage at the KA_VBAT pin is
above 4.5V.
BOOTSTRAP (BOOT)
VDD3 LINEAR REGULATOR (VDD3)
This pin is connected to the bootstrap capacitor. It
provides the supply power for the switching regulator high-
side drive.
This is a VDD3 regulator output feedback pin.The emitter
of VDD3 regulator external NPN pass transitory is connected
to this pin.
SLEW-RATE (SR)
This pin can programmed to be the output of the VDD3
Standby regulator (see Table 6).
Slew-rate Control of the switching regulator. The slew-rate
of the switching regulator can be adjusted by connecting this
pin to switch node (SW pin, slow slew-rate selection), BOOT
pin (fast slew-rate selection), or it can be left open (medium
slew-rate selection).
VDD3 LINEAR REGULATOR BASE DRIVE
(VDD3_B)
This pin can be used also as an additional standby
regulator without the external pass transistor.This output
supplies current into the base of the regulator external pass
NPN transistor.
SWITCH NODE (SW)
This pin is the source of the switching regulator internal
power switch (N-channel MOSFET source).
GROUND (GND)
BATTERY VOLTAGE SUPPLY (VBAT)
This pin is the ground pin of the integrated circuit.
Voltage supply to the IC (external reverse battery
protection is recommended).
VOLTAGE IGNITION (VIGN)
This pin is the turn-on control input that is controlled
through an ignition switch. This pin is reverse battery
protected.
33730
Analog Integrated Circuit Device Data
Freescale Semiconductor
13
FREESCALE [ Freescale ]
