LTC2941CDCB-1#PBF Linear Technology, LTC2941CDCB-1#PBF Datasheet - Page 7

• Manufacturer Part Number: LTC2941CDCB-1#PBF
• Description: IC, BATTERY FUEL GAUGE LI-ION 5.5V DFN-6
• Manufacturer: Linear Technology

Specifications of LTC2941CDCB-1#PBF

• Battery Management Function: Fuel Gauge, Charge Controller
• Battery Type: Li-Ion
• Supply Voltage Range: 2.7V To 5.5V
• Battery Ic Case Style: DFN
• No. Of Pins: 6
• Rohs Compliant: Yes

applicaTions inFormaTion
I
The LTC2941 communicates with a bus master using a
2-wire interface compatible with I
hard-coded I
The LTC2941 is a slave-only device. Therefore the serial
clock line (SCL) is input only while the data line (SDA) is
bidirectional. For more details refer to the I
section.
Internal Registers
The LTC2941 integrates current through a sense resistor
and stores a 16-bit result, accumulated charge, as two
bytes in registers C and D. Two byte high and low limits
programmed in registers E, F , G and H are continuously
compared against the accumulated charge. If either limit is
exceeded, a corresponding flag is set in the status register
bits A[2] or A[3]. If the alert mode is enabled, the AL/CC
pin pulls low.
The internal eight registers are organized as shown in
Table 1:
Table 1. Register Map
R = Read, W = Write
2
ADDRESS NAME REGISTER DESCRIPTION
C/SMBus Interface
00h
01h
02h
03h
04h
05h
06h
07h
A
B
C
D
G
H
E
F
2
C address of LTC2941 is 1100100.
Status
Control
Accumulated Charge MSB
Accumulated Charge LSB
Charge Threshold High MSB
Charge Threshold High LSB
Charge Threshold Low MSB
Charge Threshold Low LSB
2
C and SMBus. The 7-bit
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
2
C Protocol
See Below
DEFAULT
3Ch
7Fh
00h
00h
FFh
FFh
FFh
Status Register (A)
Table 2 shows the details of the status register (address
00h):
Table 2. Status Register A (Read Only)
The AL/CC pin can be configured to pull low whenever any
status register bit is set (except for bit A[7] and A[0]), using
control register bits B[2] and B[1]. All status register bits
except A[7] are cleared after being read by the host if the
conditions which set these bits have been removed.
As soon as one of the measured quantities exceeds the
programmed limits, the corresponding bit A[3], A[2] or
A[1] in the status register is set.
A[7] Chip Identification
A[6] Reserved
A[5] Accumulated Charge
A[4] Reserved
A[3] Charge Alert High
A[2] Charge Alert Low
A[1] V
A[0] Undervoltage
BIT NAME
Overflow/Underflow
Lockout Alert
BAT
Alert
OPERATION
1: LTC2941
0: LTC2942
Not Used.
Indicates that the value of the
accumulated charge hit either
top or bottom.
Not used.
Indicates that the accumulated
charge value exceeded the
charge threshold high limit.
Indicates that the accumulated
charge value dropped below
the charge threshold low limit.
Indicates that the battery
voltage (at SENSE
below selected V
Indicates recovery from
undervoltage. If equal to 1,
a UVLO has occurred and
the content of registers is
uncertain.
BAT
–
) dropped
threshold.
LTC2941
DEFAULT
X
1
0
0
0
0
0
0
2941fa