ATA6871.pdf 데이터시트 (총 23 페이지) - 파일 다운로드 ATA6871 데이타시트 다운로드

No Preview Available !

Features
Overvoltage Monitoring
Undervoltage Monitoring
Cell Temperature Monitoring
Self-diagnosis including
– Comparator Functions
– Communication Lines
– Short and Open Measuring Lines
Hot Plug-in Capable
Less than 10 µA Stand-by Current
Low Cell Imbalance Current (< 10 µA)
Circuit Customization, e.g. for Over/Undervoltage Thresholds Possible for Adequate
Volumes
Cost-efficient Solution Due to Cost Optimized 30V CMOS Technology
Daisy-chainable
– Each IC Monitors 6 Battery Cells
– 16 ICs (96 Cells) per String
– No Limit on Number of Strings
– Reliable Communication between Stacked ICs Due to Level Shifters with Current
Sources
Package SSO28
www.DataSheet4U.com
Li-ion Battery
Management
Monitoring
Emergency and
Backup Circuit
ATA6871
Applications
Backup Battery-Cell Monitoring System for Li-ion Batteries
Emergency Indicator in Li-ion Batteries
Monitoring System in Li-ion Batteries
Preliminary
Benefits
Highest Safety Level for Li-ion Battery Systems
Circuit Customization, e.g. Over and Undervoltage Thresholds, Possible for Large
Production Volumes
1. General Description
The ATA6871 is a battery cell monitoring circuit designed to act as an emergency,
safety, or backup circuit in Li-ion battery systems for electrical and hybrid electrical
vehicles (EV/HEV). It monitors overvoltage, undervoltage, and the cell temperature in
Li-ion batteries without the need of a microcontroller. The circuit has an advanced
self-test functionality, which checks the proper functionality of the monitoring compar-
ators as well as the communication lines. It can be used as a monitoring circuit as well
as an emergency indicator or as a backup system in Li-ion battery management sys-
tems. The ATA6871 can monitor four, five, or six battery cells. Up to 16 IC’s can be
cascaded. If one or more battery cells exceed the over or undervoltage thresholds for
longer than 2 seconds, or if the temperature input exceeds the temperature limit for
more than 2 seconds, a digital output signal is set to high.
9123B–AUTO–07/09

No Preview Available !

2. Block Diagram
Figure 2-1. Top-level Block Diagram
MBAT7
MBAT6
OV
Cell 6:
Over-voltage
Under-voltage
Detection
UV
6
MBAT2
MBAT1
VDD
OV
Cell 1:
Over-voltage
Under-voltage
Detection
UV
TEMP_IN
NTC
Over-
temperature
comparator
6
Test
www.DataSheet4U.com
To ATA6871
above
VDDHV
Standby Control
RC-OSC
Self test
PD_N
PD_N_OUT
STATUS_IN
STATUS
3.3V Internal
Voltage Regulator
Internal Biasing
VDD
BIASRES
Chip
Configuration
4 Input OR
CHIPONE
CHIPLAST
CONF1
CONF0
OROUT_IN
OROUT
VSSA
SCANMODE
CLK
TEST_HV TEST_LV
ENUV
To ATA6871
below
2 ATA6871 [Preliminary]
9123B–AUTO–07/09

No Preview Available !

3. Pin Configuration
Figure 3-1. Pinning SSO28
VDDHV 1
MBAT7 2
MBAT6 3
MBAT5 4
MBAT4 5
MBAT3 6
MBAT2 7
MBAT1 8
TEST_HV 9
TEST_LV 10
VSSA 11
BIASRES 12
CHIPONE 13
CHIPLAST 14
ATA6871
ATA6871 [Preliminary]
www.DataSheet4U.com
28 STATUS_IN
27 OROUT_IN
26 PD_N
25 PD_N_OUT
24 VDD
23 VDD
22 OROUT
21 STATUS
20 SCANMODE
19 CLK
18 ENUV
17 TEMP_IN
16 CONF0
15 CONF1
Table 3-1.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Pin Description
Symbol Function
Remark
VDDHV Supply voltage
MBAT7 Battery monitoring line
MBAT6 Battery monitoring line
MBAT5 Battery monitoring line
MBAT4 Battery monitoring line
MBAT3 Battery monitoring line
MBAT2 Battery monitoring line
MBAT1 Battery monitoring line
TEST_HV Test-mode pin
Keep pin open (output)
TEST_LV Test-mode pin
Keep pin open (output)
VSSA
Negative supply voltage
BIASRES Internal supply current adjustment
CHIPONE Indicates circuit position in battery string (first, middle, last)
CHIPLAST Indicates circuit position in battery string (first, middle, last)
CONF1 Programs how many cells will be monitored (4, 5, or 6 cells operating)
CONF0 Programs how many cells will be monitored (4, 5, or 6 cells operating)
TEMP_IN Input for battery-cell temperature monitoring
ENUV
Enable/Disable under-voltage detection
9123B–AUTO–07/09
3

No Preview Available !

Table 3-1.
Pin
19
20
21
22
23
24
25
26
27
28
Pin Description
Symbol Function
CLK Test-mode pin
SCANMODE Test-mode pin
STATUS Status output
OROUT Output signal battery-cells in limits/out of limits
VDD
Voltage regulator output
VDD
Voltage regulator output
PD_N_OUT Power down output
PD_N
Power down input
OROUT_IN Input for the OROUT signal of the upper ATA6871 circuit
STATUS_IN Input for the STATUS signal of the upper ATA6871 circuit
www.DataSheet4U.com
Remark
Connected to VSSA
Connected to VSSA
Internally connected to pin 23
4 ATA6871 [Preliminary]
9123B–AUTO–07/09

No Preview Available !

ATA6871 [Preliminary]
4. System Overview
The ATA6871 can be stacked in one string up to 16 times.
www.DataSheet4U.com
Figure 4-1. Battery Management Architecture with one Battery String
ATA6871
ATA6871
ATA6871
ATA6871
2
Status/
Battery
Cells
OK, not OK
9123B–AUTO–07/09
5