MC34673 Datasheet, PDF (18/22 Pages) Freescale Semiconductor, Inc – High Input Voltage 1.2A Charger for Single-cell Li-Ion Batteries

TYPICAL APPLICATIONS
APPLICATIONS
MCU INTERFACED CHARGER
When the charger is used in handheld systems with MCU
control, the MC34673 uses PPR to report the DC input status
to the MCU. After the MCU pulls the EN pin to a logic-low
voltage to start charging, the MC34673 reports the charge
status through CHG and FAST pins to the MCU. The MCU
can also monitor the charge current by measuring the voltage
at the ISET pin. Figure 24 is the typical application circuit.
Input
1µF
5.23k
VIN
GND
BAT
2.2µF
Li+
ISET
CHG
PPR
FAST
EN
OFF
ON
Figure 24. MCU Interfaced Charger
V_IO
100kx3
MCU
34673
18
Analog Integrated Circuit Device Data
Freescale Semiconductor