MAX712 Maxim, MAX712 Datasheet - Page 7

• Manufacturer Part Number: MAX712
• Description: NiCd/NiMH Battery Fast-Charge Controllers
• Manufacturer: Maxim

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