Rainbow Electronics DS2712 - Manual

1 of 13 012005
DESCRIPTION
The DS2711 and DS2712 are ideal for in-system or
stand-alone charging of 1 or 2 AA or AAA NiMH
“loose” cells. Temperature, voltage, and charge time
are monitored to provide proper fast charging control
algorithms for nickel metal hydride (NiMH) batteries.
Battery tests are included to detect defective or
inappropriate cells such as alkaline primary batteries.
The DS2711/DS2712 support series and parallel
topologies, with independent monitoring and control of
each cell. Charging of NiCd chemistry cells is also
supported.
FEATURES
§ Charge 1 or 2 NiMH Cells
§ Detect and Avoid Charging Alkaline Cells
§ Precharge Deeply Depleted Cells
§ Fast Charge NiMH with -DV Termination
Sensitivity of 2mV (typ)
§ Monitor Voltage, Temperature, and Time for
Safety and Secondary Termination
§ Regulate Charge Current:
Linear Control (DS2711)
Switch-Mode Control (DS2712)
§ Drive PMOS or PNP-Type Pass Element or
Switch, or an Optocoupler
§ Compatible with Popular Optocouplers and
Integrated Primary Side PWM Controllers
§ Small 16-Pin SO Package
APPLICATIONS
Desktop/Stand-Alone Chargers (AAA/AA)
Digital Still Cameras
Music Players
Games
Toys
PIN CONFIGURATION
VP2 16
VP1 15
CC1 1
CC2 2
LED1 3
VSS 4
LED2 5
CSOUT 6
VN1 7
VN0 8
THM2 14
THM1 13
VDD 12
TMR 11
CTST 10
DMSEL 9
PIN DESCRIPTION
PIN NAME FUNCTION
1 CC1 Cell 1 Charge-Control Output
2 CC2 Cell 2 Charge-Control Output
3 LED1 Cell 1 Status
4 V
SS
Ground Reference and Chip-Supply
Return
5 LED2 Cell 2 Status, Mode-Select Input
6 CSOUT Current-Sense Output
7 VN1 Current-Sense + Input
8 VN0 Current-Sense - Input
9 DMSEL Display-Mode Select
10 CTST Cell Test Threshold Set
11 TMR Charge Timer Set
12 V
DD
Chip-Supply Input (4.0V to 5.5V)
13 THM1 Cell 1 Thermistor Input
14 THM2 Cell 2 Thermistor Input
15 VP1 Cell 1 Positive-Terminal Sense Input
16 VP2 Cell 2 Positive-Terminal Sense Input
Table 1. ORDERING INFORMATION
PART MARKING PIN-PACKAGE
DS2711Z DS2711 16 SOIC
DS2711Z/T&R DS2711
16 SOIC,
Tape-and-Reel
DS2712Z DS2712 16 SOIC
DS2712Z/T&R DS2712
16 SOIC,
Tape-and-Reel
DS2711/DS2712
Loose Cell NiMH Chargers
www.maxim-ic.com
See Table 1 for Ordering Information.
16 SOIC