X3102 Datasheet, PDF (2/32 Pages) Intersil Corporation – 3 Cell Li-Ion Battery Protection and Monitor IC

X3102
Functional Diagram
VCC RGP RGC RGO
UVP/OCP OVP/LMON
VCELL1
CB1
VCELL2
CB2
VCELL3
CB3
VSS
NC
Over-charge
Over-discharge
Protection
Sense
Circuits
Protection
Sample Rate
Timer
Overcurrent
Protection &
Current Sense
5VDC
Regulator
FET Control
Circuitry
Internal Voltage Regulator
Power-On reset &
Status Register
Protection Circuit
Timing Control
& Configuration
Configuration
Register
4 kbit
EEPROM
Control
Register
Analog
MUX
SPI
I/F
AS0
AS1
AS2
AO
S0
SCK
CS
SI
VSS
VCS1 VCS2
OVT UVT OCT
Pin Names
PIN SYMBOL
DESCRIPTION
1 VCELL1 Battery cell 1 voltage input. This pin is used to monitor the voltage of this battery cell internally. The voltage of an individual
cell can also be monitored externally at pin AO.
The X3102 monitors 3 battery cells.
2
CB1 Cell balancing FET control output 1. This output is used to switch an external FET in order to perform cell voltage balancing
control. This function can be used to adjust an individual cell voltage (e.g., during cell charging). CB1 can be driven high (Vcc)
or low (Vss) to switch the external FET ON/OFF.
3 VCELL2 Battery cell 2 voltage. This pin is used to monitor the voltage of this battery cell internally. The voltage of an individual cell can
also be monitored externally at pin AO.
The X3102 monitors 3 battery cells.
4
CB2 Cell balancing FET control output 2. This output is used to switch an external FET in order to perform cell voltage balancing
control. This function can be used to adjust individual cell voltages (e.g., during cell charging). CB2 can be driven high (Vcc) or
low (Vss) to switch the external FET ON/OFF.
5 VCELL3 Battery cell 3 voltage. This pin is used to monitor the voltage of each battery cell internally. The voltage of an individual cell
can also be monitored externally at pin AO.
The X3102 monitors 3 battery cells.
6
CB3 Cell balancing FET control output 3. This output is used to switch an external FET in order to perform cell voltage balancing
control. This function can be used to adjust an individual cell voltage (e.g., during cell charging). CB3 can be driven high (Vcc)
or low (Vss) to switch the external FET ON/OFF.
7
VSS Ground.
8
NC
No Connect.
9
VSS Ground.
10 VCS1 Current sense voltage pin 1. A sense resistor (R_SENSE) is connected between VCS1 and VCS2 (Figure 1). R_SENSE has a
resistance in the order of 20mΩ to 100mΩ, and is used to monitor current flowing through the battery terminals, and protect
against overcurrent conditions. The voltage at each end of R_SENSE can also be monitored at pin AO.
11
VCS2 Current sense voltage pin 2. A sense resistor (R_SENSE) is connected between VCS1 and VCS2 (Figure 1). R_SENSE has a
resistance in the order of 20mΩ to 100mΩ, and is used to monitor current flowing through the battery terminals, and protect
against overcurrent conditions. The voltage at each end of R_SENSE can also be monitored at pin AO.
12
OVT Over-charge detect/release time input. This pin is used to control the delay time (T_OV) associated with the detection of an
over-charge condition (See section “Over-charge Protection” on page 19).
13
UVT Over-discharge detect/release time input. This pin is used to control the delay times associated with the detection (T_UV) and
release (T_UVR) of an over-discharge (undervoltage) condition (See section “Over-discharge Protection” on page 20).
14
OCT Overcurrent detect/release time input. This pin is used to control the delay times associated with the detection (T_OC) and
release (T_OCR) of an overcurrent condition (See section “Overcurrent Protection” on page 23).
2
FN8246.0
December 22, 2004