DS2770
Battery Monitor and Charge Controller
www.maxim-ic.com
FEATURES
PIN ASSIGNMENT
C Integrated charge controller supporting both
rechargeable lithium and NiMH battery
technologies
UV
CC
VDD
VIN
DQ
1
2
16
15
14
13
12
11
10
9
VCH
SNS
SNS
SNS
NC
3
2
C Available in two configurations:
– Internal 25mꢀ current-sense resistor
– External user-selectable sense resistor
C Current measurement:
– 15-bit bidirectional measurement
– Internal sense resistor configuration:
62.5ꢁA LSB and M2A dynamic range
– External sense resistor configuration:
1.56ꢁV LSB and M51.2mV dynamic range
C Current accumulation
– Internal sense resistor: 0.25mAh LSB
– External sense resistor: 6.25ꢁVh LSB
C Voltage measurement with 4.88mV resolution
C Temperature measurement using integrated
sensor with 0.125°C resolution
VSS
VSS
VSS
NC
4
5
6
7
8
IS2
IS1
DS2770
16-Pin TSSOP
PIN DESCRIPTION
UV
CC
– Battery Undervoltage Detect Output
– Charge Control Output
VCH – Charge Supply Input
SNS – Sense Resistor Connection
IS2
IS1
– Current-Sense Input
– Current-Sense Input
C 40 bytes of lockable EEPROM
C 16 bytes of general-purpose SRAM
C 42-day timer
VSS – Device Ground
DQ
– Data Input/Output
ꢀ
C Dallas 1-Wire interface with 64-bit ID
VIN – Voltage Sense Input
VDD – Power Supply Input
C 1.8V logic levels
C Low power consumption:
NC
– No Connect
– Active current:
– Sleep current:
80ꢁA typical
0.5ꢁA typical
ORDERING INFORMATION
ORDERING NUMBER
DS2770AE
MARKING DESCRIPTION
D2770EA
D2770EB
D2770EA
D2770EB
2770EAR
2770EBR
2770EAR
2770EBR
TSSOP, Ext. Sense Res., 4.1V Charge Voltage
DS2770BE
TSSOP, Ext. Sense Res., 4.2V Charge Voltage
DS2770AE on Tape & Reel
DS2770AE/T&R
DS2770BE/T&R
DS2770BE on Tape & Reel
DS2770AE-025
TSSOP, 25mꢀ Sense Res., 4.1V Charge Voltage
TSSOP, 25mꢀ Sense Res., 4.2V Charge Voltage
DS2770AE-025 on Tape & Reel
DS2770BE-025
DS2770AE-025/T&R
DS2770BE-025/T&R
DS2770BE-025 on Tape & Reel
1-Wire is a registered trademark of Dallas Semiconductor.
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