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參數(shù)資料
| 型號： | LTC2941IDCB#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | 2 X 3 MM, LEAD FREE, PLASTIC, MO-229, DFN-6 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 199K |
| 代理商： | LTC2941IDCB#TRPBF |
LTC2941
7
2941fa
applicaTions inFormaTion
I2C/SMBus Interface
The LTC2941 communicates with a bus master using a
2-wire interface compatible with I2C and SMBus. The 7-bit
hard-coded I2C address of LTC2941 is 1100100.
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 I2C Protocol
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
comparedagainsttheaccumulatedcharge.Ifeitherlimitis
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
ADDRESS NAME REGISTER DESCRIPTION
R/W
DEFAULT
00h
A
Status
R
See Below
01h
B
Control
R/W
3Ch
02h
C
Accumulated Charge MSB
R/W
7Fh
03h
D
Accumulated Charge LSB
R/W
FFh
04h
E
Charge Threshold High MSB
R/W
FFh
05h
F
Charge Threshold High LSB
R/W
FFh
06h
G
Charge Threshold Low MSB
R/W
00h
07h
H
Charge Threshold Low LSB
R/W
00h
R = Read, W = Write
Status Register (A)
Table 2 shows the details of the status register (address
00h):
Table 2. Status Register A (Read Only)
BIT NAME
OPERATION
DEFAULT
A[7] Chip Identification
1: LTC2941
0: LTC2942
1
A[6] Reserved
Not Used.
0
A[5] Accumulated Charge
Overflow/Underflow
Indicates that the value of the
accumulated charge hit either
top or bottom.
0
A[4] Reserved
Not used.
0
A[3] Charge Alert High
Indicates that the accumulated
charge value exceeded the
charge threshold high limit.
0
A[2] Charge Alert Low
Indicates that the accumulated
charge value dropped below
the charge threshold low limit.
0
A[1] VBAT Alert
Indicates that the battery
voltage (at SENSE–) dropped
below selected VBAT threshold.
0
A[0] Undervoltage
Lockout Alert
Indicates recovery from
undervoltage. If equal to 1,
a UVLO has occurred and
the content of registers is
uncertain.
X
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]), us-
ing 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.
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