LTC2942CDCB-1#PBF Linear Technology, LTC2942CDCB-1#PBF Datasheet - Page 8

• Manufacturer Part Number: LTC2942CDCB-1#PBF
• Description: IC, BATTERY FUEL GAUGE LI-ION 5.5V DFN-6
• Manufacturer: Linear Technology

Specifications of LTC2942CDCB-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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

operaTion
LTC2942
Power-Up Sequence
When SENSE
2.5V, the LTC2942 generates an internal power-on reset
(POR) signal and sets all registers to their default state.
In the default state, the coulomb counter is active while
the voltage and temperature ADC is switched off. The
applicaTions inFormaTion
I
The LTC2942 communicates with a bus master using a
2-wire interface compatible with I
hard-coded I
The LTC2942 is a slave-only device. Therefore the serial
clock line (SCL) is an input only while the serial data line
(SDA) is bidirectional. The device supports I
and fast mode. For more details refer to the I
section.
Internal Registers
The LTC2942 integrates current through a sense resistor,
measures battery voltage and temperature and stores the
results in internal 16-bit registers accessible via I
and low limits can be programmed for each measurement
quantity. The LTC2942 continuously monitors these limits
and sets a flag in the onboard status register when a limit
is exceeded. If the alert mode is enabled, the AL/CC pin
pulls low.

2
C/SMBus Interface
2
+
C address of the LTC2942 is 1100100.
rises above a threshold of approximately
2
C and SMBus. The 7-bit
2
2
C standard
C Protocol
2
C. High
accumulated charge register is set to mid-scale (7FFFh),
all low threshold registers are set to 0000h and all high
threshold registers are set to FFFFh. The alert mode is
enabled and the coulomb counter prescaling factor M is
set to 128.
The sixteen internal registers are organized as shown in
Table 1.
Table 1. Register Map
R = Read, W = Write, XX = Unknown
ADDRESS
0Ah
0Bh
0Ch
0Dh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Eh
0Fh
NAME REGISTER DESCRIPTION
M
A
B
C
D
G
H
K
N
O
P
E
F
J
L
I
Status
Control
Accumulated Charge MSB
Accumulated Charge LSB
Charge Threshold High MSB
Charge Threshold High LSB
Charge Threshold Low MSB
Charge Threshold Low LSB
Voltage MSB
Voltage LSB
Voltage Threshold High
Voltage Threshold Low
Temperature MSB
Temperature LSB
Temperature Threshold High
Temperature Threshold Low
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
See Below
DEFAULT
XXh
XXh
XXh
XXh
3Ch
00h
00h
00h
00h
7Fh
FFh
FFh
FFh
FFh
FFh
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