NiCd /NiMH Ba t t e ry
Fa s t -Ch a rg e Co n t ro lle rs
2/MAX713
Table 2. Programming the Number
of Cells
Table 3. Programming the Maximum
Charge Time
Number
of Cells
A/D
PGM1 Connection
PGM0 Connection
Voltage-
Slope
Termination
Timeout Sampling
PGM3
PGM2
(min)
Interval
(sec) (t )
A
Connection Connection
1
2
V+
Open
REF
V+
V+
22
22
21
21
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
V+
V+
Open
REF
3
V+
4
BATT-
V+
V+
33
21
V+
V+
5
Open
Open
Open
Open
REF
33
21
V+
BATT-
Open
REF
6
Open
REF
45
42
Open
Open
Open
Open
REF
7
45
42
8
BATT-
V+
66
42
V+
66
42
BATT-
Open
REF
9
90
84
10
11
12
13
14
15
16
Open
REF
REF
90
84
REF
REF
132
132
180
180
264
264
84
REF
V+
BATT-
V+
REF
84
REF
BATT-
Open
REF
BATT-
BATT-
BATT-
BATT-
168
168
168
168
BATT-
BATT-
BATT-
BATT-
Open
REF
V+
BATT-
BATT-
V+
+5V SHUNT
REGULATOR
GND
PGM2 PGM3
FASTCHG
TIMED_OUT
N
BATT-
POWER_ON_RESET
TIMER
BATT-
DRV
CC
FAST_CHARGE
IN_REGULATION
CURRENT
AND
VOLTAGE
REGULATOR
PGM2
PGM3
∆V_DETECT
∆V
DETECTION
CONTROL LOGIC
V+
BATT-
GND
100k
VLIMIT
BATT+
PGMx
UNDER_VOLTAGE
HOT
100k
THI
TEMP
TLO
TEMPERATURE COLD
COMPARATORS
PGM0
PGM1
REF
CELL_VOLTAGE
MAX712
MAX713
0.4V
BATT-
BATT-
INTERNAL IMPEDANCE OF PGM0–PGM3 PINS
Figure 1. Block Diagram
_______________________________________________________________________________________
7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
