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PDF DS2745 Data sheet ( Hoja de datos )
| Número de pieza | DS2745 | |
| Descripción | Low-Cost I2C Battery Monitor | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-4631; 5/09
www.maxim-ic.com
FEATURES
16-Bit Bidirectional Current Measurement
1.56V LSB, ±51.2mV Dynamic Range
104A LSB, ±3.4A Dynamic Range (RSNS =
15m)
Current Accumulation Register Resolution
6.25Vhr LSB, ±204.8mVh Range
0.417mAhr LSB, ±13.65Ah Range
(RSNS = 15m)
11-Bit Voltage Measurement
4.88mV LSB, 0V to 4.5V Input Range
11-Bit Temperature Measurement
0.125ºC Resolution, -20ºC to +70ºC
Industry Standard I2C* Interface
Low Power Consumption:
Active Current:
70A typical, 100A max
Sleep Current:
1A typical, 3A max
BLOCK DIAGRAM
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DS2745
Low-Cost I2C Battery Monitor
PIN CONFIGURATION
SCL
SDA
PIO
SNS
18
27
36
45
MAX
VDD
VIN
CTG
VSS
See Table 1 for Ordering Information.
DESCRIPTION
The DS2745 provides current-flow, voltage, and
temperature measurement data to support battery-
capacity monitoring in cost-sensitive applications. The
DS2745 can be mounted on either the host side or
pack side of the application. Current measurement
and coulomb counting is accomplished by monitoring
the voltage drop across an external sense resistor,
voltage measurement is accomplished through a
separate voltage-sense input, and temperature
measurement takes place on-chip. A standard I2C
interface with software programmable address gives
the controlling microprocessor access to all data and
status registers inside the DS2745. A low-power sleep
mode state conserves energy when the cell pack is in
storage.
APPLICATIONS
Cellular
GPS
PDAs
Handheld Products
Table 1. ORDERING INFORMATION
PART
DS2745U+
DS2745U+T&R
MARKING
2745
2745
PIN-PACKAGE
MAX package
DS2745U+ in Tape-and-Reel
+Denotes lead(Pb)-free/RoHS-compliant package.
*I2C is a trademark of Philips Corp. Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated
Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system
conforms to the I2C Standard Specification as defined by Philips.
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PIN DESCRIPTION
DS2745 Low-Cost I2C Battery Monitor
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PIN SYMBOL
FUNCTION
Serial Clock Input. 2-Wire clock line. Input only. Connect this pin to the CLOCK
1
SCL
terminal of the battery pack. Pin has an internal pulldown (IPD) for sensing
disconnection.
Serial Data Input/Output. 2-Wire data line. Open-drain output driver. Connect this pin
2
SDA
to the DATA terminal of the battery pack. Pin has an internal pulldown (IPD) for sensing
disconnection.
3
PIO
General Purpose Input/Output. Open-drain output driver with input sense. Connect
to a pull up resistor for bidirectional operation.
4
SNS
Sense Resistor Connection. Connect to the negative terminal of the battery pack.
Connect the sense resistor between VSS and SNS.
5
VSS
Device Ground. Connect to the negative terminal of the Li+ cell outside the cell
protection FETs. Connect the sense resistor between VSS and SNS.
6
CTG
Connect to Ground. Connect to the negative terminal of the Li+ cell outside the cell
protection FETs.
7 VIN Voltage Sense Input. The voltage of the Li+ cell is monitored through this input pin.
8
VDD
Power-Supply Input. Connect to the positive terminal of the Li+ cell through a
decoupling network.
Figure 2. BLOCK DIAGRAM
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Table 5. MEMORY MAP
ADDRESS (HEX)
00
Reserved
DESCRIPTION
01 Status/Config Register
02 to 08
Reserved
09 to 0D
Reserved
0A Temperature Register MSB
0B Temperature Register LSB
0C Voltage Register MSB
0D Voltage Register LSB
0E Current Register MSB
0F Current Register LSB
10 Accumulated Current Register MSB
11 Accumulated Current Register LSB
12 to 61
Reserved
61 Offset Bias Register
62 Accumulation Bias Register
63 to FF
Reserved
DS2745 Low-Cost I2C Battery Monitor
READ/WRITE
—
R/W
—
—
R
R
R
R
R
R
R/W
R/W
—
R/W
R/W
—
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POR DEFAULT
11000000b
No Change
No Change
00h
00h
STATUS/CONFIG REGISTER
The Status/Config register is read/write with individual bits designated as read only. Bit values indicate status as
well as program or select device functionality.
Figure 10. STATUS/CONFIG REGISTER FORMAT
BIT 7
X
BIT 6
PORF
BIT 5
SMOD
ADDRESS 01
BIT 4
NBEN
BIT 3
PIO
BIT 2
A2
BIT 1
A1
BIT 0
A0
X — Reserved.
PORF — The Power-On-Reset Flag is set to indicate initial power-up. PORF is not cleared internally. The user
must write this flag value to a 0 in order to use it to indicate subsequent power-up events. If PORF indicates a
power-on-reset, the ACR could be misaligned with the actual battery state of charge. The system can request a
charge to full in order to synchronize the ACR with the battery charge state. PORF is read/write-to-zero.
SMOD — SLEEP Mode Enable. A value of 1 allows the DS2745 to enter sleep mode when both SDA and SCL
pins is low for 2s. A value of 0 disables the transition to sleep mode. The power-up default of SMOD = 0.
NBEN — Negative Blanking Enable. A value of 1 enables blanking of negative current values up to 25V. A value
of 0 disables blanking of negative currents. The power-up default of NBEN = 0.
PIO — Programmable Input/Output. PIO provides both control of the PIO open-drain output driver and readback of
the PIO pin logic level. Writing a 0 to PIO drives PIO pin low. Writing a 1 deactivates the PIO output and allows
readback of an external signal. Reading PIO returns the logic state on the pin. PIO is RESET on POR.
A2:A0 — I2C Slave Address bits. A2:A0 set the lower 3 bits of the I2C slave address. When modified from the
power-up default slave address of 1001000b, accessing the DS2745 requires the modified slave address following
a start or repeated start.
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| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet DS2745.PDF ] | |
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