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DS2770AE-025 の電気的特性と機能

DS2770AE-025のメーカーはDallas Semiconducotrです、この部品の機能は「Battery Monitor and Charge Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 DS2770AE-025
部品説明 Battery Monitor and Charge Controller
メーカ Dallas Semiconducotr
ロゴ Dallas Semiconducotr ロゴ 




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DS2770AE-025 Datasheet, DS2770AE-025 PDF,ピン配置, 機能
www.maxim-ic.com
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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DS2770AE-025 pdf, ピン配列
BLOCK DIAGRAM Figure 1
DS2770
1-WIRE
DQ
INTERFACE
AND
ADDRESS
THERMAL
SENSE
VOLTAGE
REFERENCE
MUX
ADC
VIN
IS1 ADC
IS2
REGISTERS AND
USER MEMORY
LOCKABLE EEPROM
SRAM
TEMPERATURE
VOLTAGE
CURRENT
ACCUM CURRENT
TIMER
STATUS/CONTROL
TIMEBASE
VCH
SNS
CHARGE CONTROL
Internal sense resistor configuration only
25mW
CHIP GROUND
CC
UV
VSS
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3Pages


DS2770AE-025 電子部品, 半導体
DS2770
POWER MODES
The DS2770 has two possible power modes: Active Mode and Sleep Mode. While in Active Mode, the
DS2770 continually measures current, voltage, temperature, and time. Also, current flow is accumulated,
charge control is provided, and data is available to the host system. In Sleep Mode, the DS2770 ceases
these activities. The DS2770 can enter Sleep Mode only when the PMOD bit in the Status Register is set
to 1 and the following other conditions occur:
§ The CINI bit is set to 0 and the DQ line is held low for longer than two seconds. If a charge is in
progress, charging will immediately stop and the device will begin transition to Sleep Mode.
§ The CINI bit is set to 1 and the DQ line is held low for longer than two seconds. If a charge is in
progress, the DS2770 will not go into Sleep Mode until the charge operation is completed.
The DS2770 returns to Active Mode when any of the following occurs:
§ The DQ line is pulled high.
§ The voltage on VCH becomes greater than VDD (charger connection) with the CINI bit set to 1.
Once the DS2770 identifies the 2 second DQ low condition, a transition to Sleep Mode begins. This
process will take up to an additional 11 seconds before the supply current drops to ISLEEP levels.
The DS2770 defaults to Active Mode when power is first applied to VDD.
CHARGER FUNCTION
The DS2770 operates as a standalone charge controller supporting rechargeable lithium and NiMH
battery technologies. The battery type to be charged is selectable through the CTYPE bit of the Status
Register (0 for rechargeable lithium and 1 for NiMH). Charge control of both battery types is performed
by on/off gating of an external constant current or current-limited charge source. If the battery voltage is
less than VLB and a charge source is present, pin UV is driven low, signifying the need to recover the
battery at a reduced rate before fast charging can begin. In Figure 2’s application circuit, UV gates a
trickle-charge current limited by a 360W series resistor. Selection of this resistor depends on the
characteristics of the charge source. UV is driven low independent of any other state of the pack,
including pack temperature and the status of the CINI bit. UV is driven high when the battery voltage
reaches VLB. While trickle charging, a “charge in progress” status is indicated with (0, 1) values,
respectively, in the CSTAT1 and CSTAT0 bits of the Status Register assuming any previous charge
sequence completed status has been cleared.
Fast charging can be initiated by one of two methods:
1) Issuing a Start Charge command [B5h].
2) Introducing a charge supply on the VCH pin when the CINI bit in the Status Register is a 1.
Note that if VDD is below approximately 1.8V prior to using either initiation method, fast charge will not
start after the battery is trickle charged to VLB.
After initiation, the start of fast charge may be postponed if any of the following conditions exist:
§ The temperature is outside the valid charge window specified by TCL (0°C) and TCH (40°C).
§ Charge source is not present (VCH < VDD).
§ Conversion data is not valid (data becomes valid 110ms after waking from Sleep Mode).
§ Battery voltage is less than the low-battery-voltage threshold, VLB, (3.0V).
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部品番号部品説明メーカ
DS2770AE-025

Battery Monitor and Charge Controller

Dallas Semiconducotr
Dallas Semiconducotr


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