MCP73871DM-VPCC Microchip Technology, MCP73871DM-VPCC Datasheet - Page 16

• Manufacturer Part Number: MCP73871DM-VPCC
• Description: DEMO BOARD FOR MCP73871
• Manufacturer: Microchip Technology

Specifications of MCP73871DM-VPCC

• Main Purpose: Power Management, Battery Charger
• Embedded: No
• Utilized Ic / Part: MCP73871
• Primary Attributes: 1 Cell- Li-Ion / Li-Pol, 4.2V @ 100 ~ 500mA: USB, 1A: AC Adaptor
• Secondary Attributes: Safety Timer, Thermal Protection, Automatic Charge Termination and Recharge
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

MCP73871 Demo Board with Voltage Proportional Current Control User’s Guide
DS51812B-page 16
2.3.4
The MCP73871 device monitors continuously the battery temperature during a charge
cycle by measuring the voltage between the THERM and V
source provides the bias for most common 10 kΩ negative-temperature coefficient
thermistors (NTC). The MCP73871 device compares the voltage at the THERM pin to
factory set thresholds of 1.24V and 0.25V, typically. Once a voltage outside the
thresholds is detected during a charge cycle, the MCP73871 device immediately
suspends the charge cycle, by turning off the charge and holding the timer value. The
charge cycle resumes when the voltage at the THERM pin returns to the normal range.
To activate this feature, remove R6 resistor and connect a 10 kΩ NTC thermistor to TP6
and TP7 test points.
FIGURE 2-5:
900 mAh Li-Ion Cell.
Temperature Monitoring Option
5
4
3
2
1
0
0
MCP73871 Charge Profile in Constant Voltage Mode for a
25
50
Time (min)
75
Cell Temperature / 10
I
100
Charge
V
BAT
© 2009 Microchip Technology Inc.
SS
125
pins. An internal current
150
1
0.8
0.6
0.4
0.2
0