ISL78600 Datasheet, PDF (4/22 Pages) Intersil Corporation – Multi-Cell Li-Ion Battery Manager

ISL78600
Pin Descriptions
SYMBOL
PIN NUMBER
DESCRIPTION
VC0, VC1, VC2, VC3, VC4,
VC5, VC6, VC7, VC8, VC9,
VC10, VC11, VC12
20, 18, 16,
14, 12, 10, 8,
6, 4, 2, 64,
62, 60
Battery cell voltage inputs. VCn connects to the positive terminal of CELLn and the negative terminal of
CELLn+1. (VC12 connects only to the positive terminal of CELL12 and VC0 only connects with the negative
terminal of CELL1.)
CB1, CB2, CB3, CB4, CB5, 19, 17, 15, Cell Balancing FET control outputs. Each output controls an external FET which provides a current path
CB6, CB7, CB8, CB9, CB10, 13, 11, 9, 7, around the cell for balancing.
CB11, CB12
5, 3, 1, 63, 61
VBAT
58, 59 Main IC Supply pins. Connect to the most positive terminal in the battery string.
VSS
21, 22 Ground. These pins connect to the most negative terminal in the battery string.
ExT1, ExT2, ExT3, ExT4
24, 26, 28, External temperature monitor or general purpose inputs. The temperature inputs are intended for use with
30
external resistor networks using NTC type thermistor sense elements but may also be used as general
purpose analog inputs at the user’s discretion. 0V to 2.5V input range.
TEMPREG
29
Temperature monitor voltage regulator output. This is a switched 2.5V output which supplies a reference
voltage to external NTC thermistor circuits to provide ratiometric ADC inputs for temperature
measurement.
VDDEXT
32
External V3P3 supply input/output. Connected to the V3P3 pin via a switch, this pin may be used to power
external circuits from the V3P3 supply. The switch is open when the ISL78600 is placed in Sleep mode.
REF
33
2.5V voltage reference decoupling pin. Connect a 2.0µF to 2.5µF X7R capacitor to VSS. Do not connect any
additional external load to this pin.
VCC
34
Analog supply voltage input. Connect to V3P3 via a 33Ω resistor. Connect a 1µF capacitor to ground.
V2P5
35
Internal 2.5V digital supply decoupling pin. Connect a 1µF capacitor to DGND.
V3P3
36
3.3V digital supply voltage input. Connect the emitter of the external NPN regulator transistor to this pin.
Connect a 1µF capacitor to DGND.
BASE
38
Regulator control pin. Connect the external NPN transistor’s base. Do not let this pin float.
DNC
37, 39, 48 Do not connect. Leave pins floating.
COMMS SELECT 1
41
Communications port 1 mode select pin. Connect via a 1kΩ resistor to V3P3 for Daisy Chain
communications on port 1 or to DGND for SPI operation on port 1.
COMMS SELECT 2
40
Communications port 2 mode select pin. Connect via a 1kΩ resistor to V3P3 to enable port 2 or to DGND
to disable this port.
COMMS RATE 0,
COMMS RATE 1
43, 42
Daisy Chain communications data rate setting. Connect via a 1kΩ resistor to DGND (‘0’) or to V3P3 (‘1’) to
select between various communication data rates.
DGND
44
Digital Ground.
FAULT
45
Logic fault output. Asserted low if a fault condition exists.
DATA READY
46
SPI data ready. Asserted low when the device is ready to transmit data to the host microcontroller.
EN
47
Enable input. Tie to V3P3 to enable the part. Tie to DGND to disable (all IC functions are turned off).
DOUT/NC
49
Serial Data Output (SPI) or NC (Daisy Chain). 0V to 3.3V push-pull output.
DIN/NC
50
Serial Data Input (SPI) or
NC (Daisy Chain). 0V to 3.3V input.
CS/DLo1
52
Chip-Select, active low 3.3V input (SPI) or Daisy Chain port 1 Lo connection.
SCLK/DHi1
53
Serial-Clock Input (SPI) or Daisy Chain port 1 Hi connection.
DHi2
56
Daisy Chain port 2 Hi connection.
DLo2
55
Daisy Chain port 2 Lo connection.
NC
23, 25, 27, No internal connection.
31, 51, 54,
57
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FN7672.6
January 20, 2015