Datasheet

MAX712/MAX713
NiCd/NiMH Battery
Fast-Charge Controllers
7
Maxim Integrated
Table 2. Programming the Number
of Cells
Table 3. Programming the Maximum
Charge Time
CONTROL LOGIC
+5V SHUNT
REGULATOR
TIMER
PGM2 PGM3
V+
BATT-
BATT-
UNDER_VOLTAGE
BATT-
DRV
V+
REF
100kΩ
100kΩ
N
HOT
ΔV_DETECT
TIMED_OUT
BATT-
FASTCHG
GND
CC
BATT-
GND
CELL_VOLTAGE
INTERNAL IMPEDANCE OF PGM0–PGM3 PINS
FAST_CHARGE
POWER_ON_RESET
IN_REGULATION
VLIMIT
BATT+
PGM0
PGM1
PGM2
PGM3
PGMx
THI
TEMP
TLO
ΔV
DETECTION
TEMPERATURE
COMPARATORS
CURRENT
AND
VOLTAGE
REGULATOR
COLD
0.4V
MAX712
MAX713
Figure 1. Block Diagram
PGM1
CONNECTION
PGM0
CONNECTION
1 V+ V+
NUMBER
OF CELLS
2 Open V+
4 BATT- V+
3 REF V+
6 Open Open
5 V+ Open
8 BATT- Open
7 REF Open
10 Open REF
9 V+ REF
12 BATT- REF
11 REF REF
14 Open BATT-
13 V+ BATT-
16 BATT- BATT-
15 REF BATT-
22 V+ REF
PGM3
CONN
PGM2
CONN
22 V+ Open
33 V+ BATT-
TIMEOUT
(min)
33 V+ V+
45 Open REF
45 Open Open
66 Open BATT-
66 Open V+
90 REF REF
90 REF Open
132 REF BATT-
132 REF V+
180 BATT- REF
180 BATT- Open
264 BATT- BATT-
264 BATT- V+
21
21
21
A/D
SAMPLING
INTERVAL
(s) (t
A
)
21
42
42
42
42
84
84
84
84
168
168
168
168
Enabled
Disabled
Enabled
VOLTAGE-
SLOPE
TERMINATION
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled