DS2770BE+

DS2770BE+ Datasheet

DS2770

Part	Datasheet
DS2770BE+	DS2770BE+ (pdf)

Related Parts	Information
DS2770BE+T&R	DS2770BE+T&R
DS2770BE+025/T&R	DS2770BE+025/T&R
DS2770AE+T&R	DS2770AE+T&R
DS2770AE+	DS2770AE+
DS2770AE+025/T&R	DS2770AE+025/T&R
DS2770AE+025	DS2770AE+025

PDF Datasheet Preview
DS2770 Battery Monitor and Charge Controller 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 1 CC 2 VCH 23 SNS 4 SNS 5 SNS 6 NC 7 IS2 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 The DS2770 battery monitor and charge controller performs several functions needed for thorough battery maintenance. When used in conjunction with the host system’s processor, a battery-pack resident DS2770 may be utilized for applications that include charging, remaining capacity estimation, safety monitoring, and nonvolatile NV parametric storage. Description continued on page 1-Wire is a registered trademark of Dallas Semiconductor. 1 of 27 052605 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 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 DS2770 DESCRIPTION TSSOP, Ext. Sense Res., 4.1V Charge Voltage, Lead-Free TSSOP, Ext. Sense Res., 4.2V Charge Voltage, Lead-Free DS2770AE+ on Tape and Reel, Lead-Free DS2770BE+ on Tape and Reel, Lead-Free TSSOP, Sense Res., 4.1V Charge Voltage, Lead-Free TSSOP, Sense Res., 4.2V Charge Voltage, Lead-Free DS2770AE+025 on Tape and Reel, Lead-Free DS2770BE+025 on Tape and Reel, Lead-Free TSSOP, Ext. Sense Res., 4.1V Charge Voltage TSSOP, Ext. Sense Res., 4.2V Charge Voltage DS2770AE on Tape and Reel DS2770BE on Tape and Reel TSSOP, Sense Res., 4.1V Charge Voltage TSSOP, Sense Res., 4.2V Charge Voltage DS2770AE-025 on Tape and Reel DS2770BE-025 on Tape and Reel DESCRIPTION CONTD. The DS2770 provides a unique ID, a digital temperature sensor, an analog-to-digital converter ADC that measures battery voltage and current, an integrated current accumulator that keeps a running total of all current entering and leaving the battery, an elapsed time meter, NV memory for storage of important parameters, and an integrated charge controller supporting rechargeable lithium including lithium-ion and lithium-ion polymer and nickel metal hydride NiMH batteries. Current measurement can be accomplished through the use of an integrated 25mW sense resistor or through an external sense resistor. The resolution of the current, voltage, and temperature measurements is sufficient for process monitoring applications such as battery-charge control and safety. The charge-control technique is user-selectable to support either pulse charge for rechargeable lithium or dT/dt termination for NiMH. Additionally, programmable charge timers and low-battery recovery are provided for safety and convenience. Information is sent to/from the DS2770 over a 1-Wire interface so that only one wire and ground needs to be connected from a processor to a DS2770. This means that DS2770-equipped battery packs need only four output connectors battery power, charge source, ground, and the 1-Wire interface. Each device has a factory-programmed 64-bit net address that allows it to be individually addressed by the host system. Two types of memory are provided on the DS2770 for battery information storage lockable EEPROM and SRAM. EEPROM memory saves important battery data in true NV memory that is unaffected by severe battery depletion, accidental shorts, or ESD events and becomes ROM when locked to provide additional security for unchanging battery data. SRAM provides inexpensive storage for temporary data. 2 of 27 BLOCK DIAGRAM Figure 1 ambient conditions. 3 Using the internal current-sense resistor. 4 Using an external current-sense resistor. 5 Typical value for tERR is at 3.6V and +25°C. 6 See Ordering Information section of data sheet to determine corresponding part number for each VCV value. 7 This specification includes the effects of temperature on the sense resistor. The DS2770 compensates for the internal sense resistor’s temperature coefficient of 3700ppm/°C to an accuracy of ±500ppm/°C. The DS2770 does not attempt to compensate for the characteristics of an external sense resistor. Error terms arising from the use of an external sense resistor should be taken into account when calculating total current measurement error. 8 Four-year data retention at +70°C. 9 ISLEEP, IACTIVE and IVCH are measured with the CC and UV pins floating. 10 VP is the greater of VDD or VCH. and test conditions VDD = VCH = 5.7V 11 The UV and CC pins are driven low with respect to the SNS pin. Current flow into UV or CC is returned to SNS and therefore is not included in the current measurement. 12 Current full-scale rating limits input saturation and nonlinear conversion under high average current signal levels of either polarity. Transient currents up to times the current full-scale rating are measured to specified accuracy if the RC filter formed by the internal resistors and external capacitor at the IS1 and IS2 pins limits the average signal level to the Current Full-Scale rating. 13 This value deviates proportionally to gain error. 27 of 27

PDF Datasheet Preview

DS2770

Battery Monitor and Charge Controller
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 1 CC 2 VCH 23 SNS 4 SNS 5 SNS 6 NC 7 IS2 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

The DS2770 battery monitor and charge controller performs several functions needed for thorough battery maintenance. When used in conjunction with the host system’s processor, a battery-pack resident DS2770 may be utilized for applications that include charging, remaining capacity estimation, safety monitoring, and nonvolatile NV parametric storage. Description continued on page
1-Wire is a registered trademark of Dallas Semiconductor.
1 of 27
052605
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

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

DS2770

DESCRIPTION TSSOP, Ext. Sense Res., 4.1V Charge Voltage, Lead-Free TSSOP, Ext. Sense Res., 4.2V Charge Voltage, Lead-Free DS2770AE+ on Tape and Reel, Lead-Free DS2770BE+ on Tape and Reel, Lead-Free TSSOP, Sense Res., 4.1V Charge Voltage, Lead-Free TSSOP, Sense Res., 4.2V Charge Voltage, Lead-Free DS2770AE+025 on Tape and Reel, Lead-Free DS2770BE+025 on Tape and Reel, Lead-Free TSSOP, Ext. Sense Res., 4.1V Charge Voltage TSSOP, Ext. Sense Res., 4.2V Charge Voltage DS2770AE on Tape and Reel DS2770BE on Tape and Reel TSSOP, Sense Res., 4.1V Charge Voltage TSSOP, Sense Res., 4.2V Charge Voltage DS2770AE-025 on Tape and Reel DS2770BE-025 on Tape and Reel

DESCRIPTION CONTD.

The DS2770 provides a unique ID, a digital temperature sensor, an analog-to-digital converter ADC that measures battery voltage and current, an integrated current accumulator that keeps a running total of all current entering and leaving the battery, an elapsed time meter, NV memory for storage of important parameters, and an integrated charge controller supporting rechargeable lithium including lithium-ion and lithium-ion polymer and nickel metal hydride NiMH batteries. Current measurement can be accomplished through the use of an integrated 25mW sense resistor or through an external sense resistor. The resolution of the current, voltage, and temperature measurements is sufficient for process monitoring applications such as battery-charge control and safety. The charge-control technique is user-selectable to support either pulse charge for rechargeable lithium or dT/dt termination for NiMH. Additionally, programmable charge timers and low-battery recovery are provided for safety and convenience.

Information is sent to/from the DS2770 over a 1-Wire interface so that only one wire and ground needs to be connected from a processor to a DS2770. This means that DS2770-equipped battery packs need only four output connectors battery power, charge source, ground, and the 1-Wire interface. Each device has a factory-programmed 64-bit net address that allows it to be individually addressed by the host system.

Two types of memory are provided on the DS2770 for battery information storage lockable EEPROM and SRAM. EEPROM memory saves important battery data in true NV memory that is unaffected by severe battery depletion, accidental shorts, or ESD events and becomes ROM when locked to provide additional security for unchanging battery data. SRAM provides inexpensive storage for temporary data.
2 of 27

BLOCK DIAGRAM Figure 1
ambient conditions. 3 Using the internal current-sense resistor. 4 Using an external current-sense resistor. 5 Typical value for tERR is at 3.6V and +25°C. 6 See Ordering Information section of data sheet to determine corresponding part number for each VCV
value. 7 This specification includes the effects of temperature on the sense resistor. The DS2770 compensates
for the internal sense resistor’s temperature coefficient of 3700ppm/°C to an accuracy of ±500ppm/°C. The DS2770 does not attempt to compensate for the characteristics of an external sense resistor. Error terms arising from the use of an external sense resistor should be taken into account when calculating total current measurement error. 8 Four-year data retention at +70°C.
9 ISLEEP, IACTIVE and IVCH are measured with the CC and UV pins floating. 10 VP is the greater of VDD or VCH. and test conditions VDD = VCH = 5.7V
11 The UV and CC pins are driven low with respect to the SNS pin. Current flow into UV or CC is returned to SNS and therefore is not included in the current measurement.
12 Current full-scale rating limits input saturation and nonlinear conversion under high average current signal levels of either polarity. Transient currents up to times the current full-scale rating are measured to specified accuracy if the RC filter formed by the internal resistors and external capacitor at the IS1 and IS2 pins limits the average signal level to the Current Full-Scale rating.
13 This value deviates proportionally to gain error.
27 of 27

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Datasheet ID: DS2770BE+ 647172