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