MCP73853 Просмотр технического описания (PDF) - Microchip Technology
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MCP73853 Datasheet PDF : 32 Pages
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MCP73853/55
3.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
MCP73853
MCP73855
Sym
Description
1
2
VSET
Voltage Regulation Selection
2
3
VDD1
Battery Management Input Supply
3
—
VDD2
Battery Management Input Supply
4
4
VSS1
Battery Management 0V Reference
5
5
PROG
Current Regulation Set
6
—
THREF
Cell Temperature Sensor Bias
7
—
THERM
Cell Temperature Sensor Input
8
6
TIMER
Timer Set
9
—
VSS3
Battery Management 0V Reference
10
8
VBAT1
Battery Charge Control Output
11
9
VBAT2
Battery Charge Control Output
12
—
VBAT3
Battery Voltage Sense
13
7
VSS2
Battery Management 0V Reference
14
10
EN
Logic Enable
15
—
STAT2
Fault Status Output
16
1
STAT1
Charge Status Output
17
11
EP
Exposed Pad, VSS Potential
3.1 Voltage Regulation Selection
(VSET)
Connect to VSS for 4.1V regulation voltage. Connect to
VDD for 4.2V regulation voltage.
3.2 Battery Management Input Supply
(VDD1, VDD2)
A supply voltage of [VREG(Typ) + 0.3V] to 5.5V is
recommended. Bypass to VSS with a minimum of
4.7 µF.
3.3 Battery Management 0V Reference
(VSS1, VSS2, VSS3)
Connect to negative terminal of battery.
3.7 Timer Set (TIMER)
All safety timers are scaled by CTIMER/0.1 µF.
3.8 Battery Charge Control Output
(VBAT1, VBAT2)
Connect to positive terminal of battery. Drain terminal
of internal P-channel MOSFET pass transistor. Bypass
to VSS with a minimum of 4.7 µF to ensure loop stability
when the battery is disconnected.
3.9 Battery Voltage Sense (VBAT3)
Voltage sense input. Connect to positive terminal of
battery. A precision internal resistor divider regulates
the final voltage on this pin to VREG.
3.4 Current Regulation Set (PROG)
3.10 Logic Enable (EN)
Preconditioning, fast and termination currents are
scaled by placing a resistor from PROG to VSS.
3.5 Cell Temperature Sensor Bias
(THREF)
THREF is a voltage reference to bias external
thermistor for continuous cell temperature monitoring
and pre-qualification.
3.6 Cell Temperature Sensor Input
(THERM)
Input for an external thermistor for continuous cell-
temperature monitoring and prequalification. Connect
to THREF/3 to disable temperature sensing.
Input to force charge termination, initiate charge, clear
faults or disable automatic recharge.
3.11 Fault Status Output (STAT2)
Current-limited, open-drain drive for direct connection
to an LED for charge status indication. Alternatively, a
pull-up resistor can be applied for interfacing to a host
microcontroller.
3.12 Charge Status Output (STAT1)
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.
2004-2013 Microchip Technology Inc.
DS21915C-page 11
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