MCP73843 MICROCHIP [Microchip Technology], MCP73843 Datasheet - Page 10

• Manufacturer Part Number: MCP73843
• Description: Advanced Single or Dual Cell Lithium-Ion/ Lithium-Polymer Charge Management Controllers
• Manufacturer: MICROCHIP [Microchip Technology]

MCP73841/2/3/4
3.0
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
3.1
Charge current is sensed via the voltage developed
across an external precision sense resistor. The sense
resistor must be placed between the supply voltage
(V
sense resistor produces a fast charge current of
500 mA, typically.
3.2
A supply voltage of [V
recommended. Bypass to V
4.7 µF.
3.3
Current limited, open-drain drive for direct connection
to a LED for charge status indication. Alternatively, a
pull-up resistor can be applied for interfacing to a host
microcontroller.
3.4
Input to force charge termination, initiate charge, clear
faults or disable automatic recharge.
3.5
Voltage reference to bias external thermistor for
continuous
prequalification.
DS21823B-page 10
DD
MCP73841,
MCP73842
) and the external pass transistor (Q1). A 220 m
Pin No.
10
1
2
3
4
5
6
7
8
9
PIN DESCRIPTIONS
Charge Current Sense Input
(SENSE)
Battery Management Input Supply
(V
Charge Status Output (STAT1)
Logic Enable (EN)
Cell Temperature Sensor Bias
(THREF)
DD
cell
)
PIN DESCRIPTION TABLE
temperature
MCP73843,
MCP73844
Pin No.
REG
—
—
1
2
3
4
5
6
7
8
(Typ) + 0.3V] to 12V is
SS
with a minimum of
monitoring
THERM
SENSE
THREF
TIMER
STAT1
Name
V
DRV
V
V
EN
BAT
DD
SS
and
Charge Current Sense Input
Battery Management Input Supply
Charge Status Output
Logic Enable
Cell Temperature Sensor Bias
Cell Temperature Sensor Input
Timer Set
Battery Management 0V Reference
Battery Voltage Sense
Drive Output
3.6
Input for an external thermistor for continuous cell-
temperature monitoring and pre-qualification. Apply a
voltage equal to 0.85V to disable temperature-sensing.
3.7
All safety timers are scaled by C
3.8
Connect to negative terminal of battery.
3.9
Voltage sense input. Connect to positive terminal of
battery. Bypass to V
ensure loop stability when the battery is disconnected.
A precision internal resistor divider regulates the final
voltage on this pin to V
3.10
Direct output drive of an external P-channel MOSFET
for current and voltage regulation.
Cell Temperature Sensor Input
(THERM)
Timer Set (TIMER)
Battery Management 0V Reference
(V
Battery Voltage Sense (V
Drive Output (DRV)
SS
)
Function
SS
REG
with a minimum of 4.7 µF to
2004 Microchip Technology Inc.
.
TIMER
/0.1 µF.
BAT
)