DS2712 Maxim Integrated Products, Inc., DS2712 Datasheet - Page 14

• Manufacturer Part Number: DS2712
• Description: Loose Cell Nimh Chargers
• Manufacturer: Maxim Integrated Products, Inc.

Table 4. PARALLEL CONFIGURATION, EACH CELL
Series and Single Cell Charging Example:
In the series and single-cell modes, the effective fast charge current is equal to 0.969 times the regulated current
limit and the top-off current is 0.25 times the regulated current. The maintenance mode is identical to the parallel
charging rate, that is, 1/64 times the regulated current. The C-rates for charging 3 different cell capacities using a
500mA and a 1000mA current source are shown in the following table.
Table 5. SERIES CONFIGURATION, EACH CELL
LED1 and LED2 Outputs, MODE-Select Input
Open-drain outputs LED1 and LED2 pull low to indicate charge status. When inactive, the outputs are high
impedance. LED1 displays the status for the cell monitored by VP1 and LED2 displays the status for the cell
monitored by VP2.
The LED pins drive low in three “blink” patterns to annunciate the charge status. Table 6 summarizes the LED
operation in each display mode (DM0, DM1, DM2) for each charge condition. In parallel mode, LED1 indicates the
status of the cell whose positive terminal is connected to VP1 and LED2 indicates the status of the cell whose
positive terminal is connected to VP2. In series mode, LED1 indicates the charge status for both cells since they
are charged in series.
Table 6. DISPLAY PATTERNS BY DISPLAY MODE AND CHARGE ACTIVITY
High-Z = High Impedance
Package Information
For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo.
Cell Capacity
Fast
Precharge/Top-Off
Maintenance
Cell Capacity
Fast
Precharge/Top-Off
Maintenance
DM0
DM1
DM2
DISPLAY MODE
MODE
MODE
DMSEL PIN
Float
High
Low
900mAH
C/3.72
C/14.4
C/115
900mAH
C/1.86
C/7.20
C/115
CURRENT LIMIT 500mA
CURRENT LIMIT 500mA
BATTERY
High-Z
High-Z
High-Z
1700mAH
C/7.02
C/27.2
C/218
1700mAH
C/3.51
C/13.6
C/218
NO
14 of 14
PRE/FAST/TOP-
2200mAH
C/9.08
C/35.2
C/282
2200mAH
C/4.54
C/17.6
C/282
0.16s High-Z
CHARGING
0.80s Low
OFF
Low
Low
CHARGE ACTIVITY
900mAH
C/1.86
C/7.20
C/57.6
900mAH
C/0.93
C/3.60
C/57.6
CURRENT LIMIT 1000mA
CURRENT LIMIT 1000mA
MAINTENANCE
0.16s High-Z
0.80s Low
High-Z
1700mAH
C/3.51
C/13.6
C/109
1700mAH
C/1.75
C/6.80
C/109
Low
2200mAH
C/4.54
C/17.6
C/141
2200mAH
C/2.27
C/8.80
C/141
0.48s High-Z
0.16s High-Z
0.16s High-Z
0.48s Low
0.16s Low
0.16s Low
FAULT