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PDF DS2770BE Data sheet ( Hoja de datos )

Número de pieza DS2770BE
Descripción Battery Monitor and Charge Controller
Fabricantes Dallas Semiconducotr 
Logotipo Dallas Semiconducotr Logotipo



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No Preview Available ! DS2770BE Hoja de datos, Descripción, Manual

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DS2770
Battery Monitor and Charge Controller
FEATURES
§ Integrated charge controller supporting both
rechargeable lithium and NiMH battery
technologies
§ Available in two configurations:
– Internal 25mW current-sense resistor
– External user-selectable sense resistor
§ Current measurement:
– 15-bit bidirectional measurement
– Internal sense resistor configuration:
62.5mA LSB and ±2A dynamic range
– External sense resistor configuration:
1.56mV LSB and ±51.2mV dynamic range
§ Current accumulation
– Internal sense resistor: 0.25mAh LSB
– External sense resistor: 6.25mVh LSB
§ Voltage measurement with 4.88mV resolution
§ Temperature measurement using integrated
sensor with 0.125°C resolution
§ 40 bytes of lockable EEPROM
§ 16 bytes of general-purpose SRAM
§ 42-day timer
§ Dallas 1-Wireâ interface with 64-bit ID
§ 1.8V logic levels
§ Low power consumption:
– Active current: 80mA typical
– Sleep current:
0.5mA typical
PIN ASSIGNMENT
UV
CC
VCH
SNS
SNS
SNS
NC
IS2
1
2
23
4
5
6
7
8
16 VDD
15 VIN
14 DQ
13 VSS
12 VSS
11 VSS
10 NC
9 IS1
DS2770
16-Pin TSSOP
PIN DESCRIPTION
UV – Battery Undervoltage Detect Output
CC – Charge Control Output
VCH – Charge Supply Input
SNS – Sense Resistor Connection
IS2 – Current-Sense Input
IS1 – Current-Sense Input
VSS – Device Ground
DQ – Data Input/Output
VIN – Voltage Sense Input
VDD – Power Supply Input
NC – No Connect
ORDERING INFORMATION
ORDERING NUMBER
MARKING
DS2770AE
D2770EA
DS2770BE
D2770EB
DS2770AE/T&R
D2770EA
DS2770BE/T&R
D2770EB
DS2770AE-025
2770EAR
DS2770BE-025
2770EBR
DS2770AE-025/T&R
2770EAR
DS2770BE-025/T&R
2770EBR
DESCRIPTION
TSSOP, Ext. Sense Res., 4.1V Charge Voltage
TSSOP, Ext. Sense Res., 4.2V Charge Voltage
DS2770AE on Tape & Reel
DS2770BE on Tape & Reel
TSSOP, 25mW Sense Res., 4.1V Charge Voltage
TSSOP, 25mW Sense Res., 4.2V Charge Voltage
DS2770AE-025 on Tape & Reel
DS2770BE-025 on Tape & Reel
1-Wire is a registered trademark of Dallas Semiconductor.
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DS2770BE pdf
APPLICATION EXAMPLE Figure 2
PACK+
CHARGE
SOURCE
4403
FM MT71 8
360W
150W 100W
1kW
4.7kW
1kW
0.1mF
UV
CC
VCH
SNS
SNS
SNS
NC
IS2
VDD
VIN
DQ
VSS
VSS
VSS
NC
IS1
PACK-
DATA
150W
0.1mF
RSNS(1)
0.1mF
5.1V
Lithium
Protection
Circuit
SNS
DS2770
R SNS-I NT (2)
VSS
IS2 Voltage IS1
Sense
1 — RSNS is present for external sense resistor configuration only.
2 — RSNS-INT is present for internal sense resistor configuration only.
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DS2770

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DS2770BE arduino
CURRENT-OFFSET BIAS Figure 7
MSB—Address 32
S 214 213 212 211 210 29 28
MSb
LSb
DS2770
LSB—Address 33
27 26 25 24 23 22 21 20
MSb
LSb
Units: 0.0625mA for internal sense resistor
1.5625mV for external sense resistor
VOLTAGE MEASUREMENT
The DS2770 continuously measures the voltage between pins VIN and VSS with a resolution of 4.88mV
over a range of 0V to 4.992V. Measurement data is updated every 55ms and placed in the Voltage
Register in two’s complement format. Voltages above the maximum register value are reported as the
maximum value. Figure 8 shows the Voltage Register format.
VOLTAGE REGISTER FORMAT Figure 8
MSB—Address 0C
S 29 28 27 26 25 24 23
MSb
LSb
LSB—Address 0D
22 21 20 X X X X X
MSb
LSb
Units: 4.88mV
TEMPERATURE MEASUREMENT
The DS2770 uses an integrated temperature sensor to continually measure battery temperature with a
resolution of 0.125°C. Temperature measurements are updated every 55ms and placed in the Temperature
Register in two’s complement format. Figure 9 shows the Temperature Register format.
TEMPERATURE REGISTER FORMAT Figure 9
MSB—Address 18
S 29 28 27 26 25 24 23
MSb
LSb
LSB—Address 19
22 21 20 X X X X X
MSb
LSb
Units: 0.125°C
TIMER
The DS2770 provides a general-purpose timer with a range of 1024h. The timer count is stored in the
Elapsed Time Register with a resolution of approximately 56s. The count will roll over to zero when it
reaches its maximum value and begin counting up again. Additionally, the user can write any desired
value to the register. Figure 10 shows the Elapsed Time Register format.
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