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PDF ATA6870 Data sheet ( Hoja de datos )
| Número de pieza | ATA6870 | |
| Descripción | Li-Ion Battery Management | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• 12-bit Battery-cell Voltage Measurement
• Simultaneous Battery Cells Measurement in Parallel
• Cell Temperature Measurement
• Charge Balancing Capability
– Parallel Balancing of Cells Possible
• Integrated Power Supply for MCU
• Undervoltage Detection
• Less than 10 µA Standby Current
• Low Cell Imbalance Current (< 10 µA)
• Hot Plug-in Capable
• Interrupt Timer for Cycling MCU Wake-ups
• Cost-efficient Solution Due to Cost-optimized 30V CMOS Technology
• Reliable Communication between Stacked ICs Due to Level Shifters with Current
Sources and Checksum Monitoring of Data
• Daisy-chainable
– Each IC Monitors up to 6 Battery Cells
– 16 ICs (96 Cells) per String
– No Limit on Number of Strings
• Package QFN48 7 mm × 7 mm
Applications
• Battery Measurement, Supply and Monitoring IC for Li-ion and NiMH Battery Systems
in Electric (EV) and Hybrid Electrical (HEV) Vehicles
Li-Ion, NiMH
Battery
Measuring,
Charge
Balancing and
Power-supply
Circuit
ATA6870
Benefits
• Highest Safety Level for Li-ion Battery Systems in Combination with ATA6871
• Cost Reduction Due to Integrated Measurement Circuit and High Voltage Power-supply
Preliminary
1ww. w.DDataeShsecetr4Uip.cotmion
The ATA6870 is a measurement and monitoring circuit designed for Li-ion and NiMH
multicell battery stacks in hybrid electrical vehicles.
The ATA6870 monitors the battery-cell voltage and the battery-cell temperature with a
12-bit ADC.
The circuit also provides charge-balancing capability for each battery-cell.
In addition, a linear regulator is integrated to supply a microcontroller or other external
components. Reliable communication between stacked ICs is achieved by level-shift-
ers with current sources. The ATA6870 can be connected to three, four, five or six
battery-cells. Up to 16 circuits (96 cells) can be cascaded in one string. The number of
strings is not limited.
9116B–AUTO–10/09
1 page  
ATA6870 [Preliminary]
4. ATA6870 System Overview
The ATA6870 can be stacked up to 16 times in one string. The communication with MCU is car-
ried out on the lowest level through an SPI bus. The data on the SPI bus is transmitted to the 15
other ATA6870s using the communication interface implemented inside ATA6870.
Figure 4-1. Battery Management Architecture with One Battery String
ATA6870
ATA6870
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ATA6870
ATA6870
MCU
9116B–AUTO–10/09
5
5 Page 
ATA6870 [Preliminary]
Table 7-1. Electrical Characteristics
No. Parameters
Test Conditions
Maximum allowed input
1.1
current in Power-down
Mode (e.g., leakage current
of an optocoupler)
1.2 Input current in ON Mode
1.3
Maximum voltage
(pin PD_N left open)
IPD_N = 0 to 50 µA
Propagation delay time
min slope
1.4
from Power-down Mode to
NORM Mode
IPD_N
=
-1-----m-----A--
msec
Pin
PD_N
PD_N
PD_N
DVDD
Symbol Min. Typ. Max. Unit
IPD_N
IPD_N
VVDDHV -
VPD_N
tVDDON
2.5
50 µA
5 mA
5V
3 ms
Propagation delay time
1.5 from NORM Mode to
Power-down Mode
DVDD
tVDDOFF
10 ms
*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter
Type*
A
A
A
A
A
7.1.2 Normal Operating Mode (NORM Mode)
The ATA6870 turns on when the PD_N signal is switched from low to high. The power supplies
AVDD and DVDD as well as VDDHVM (if the input signal POW_ENA = high) are turned on. The
configuration registers are set to their default values. In NORM Mode the ATA6870 can acquire
analog data (voltage or temperature channels) upon request from the host microcontroller.
When the host microcontroller orders an acquisition through the SPI bus, the IC starts digitizing
all voltage and one temperature channel in parallel. The on-chip digital signal processor filters, in
real time, the channel samples. When conversion and filtering are done, the data-ready interrupt
to the host processor indicates the data availability. The MCU can now read the ADC result reg-
isters. The MCU reads the ATA6870’s status registers to check each IC and to acknowledge the
interrupt. When ATA6870 is in NORM Mode, the MCU can be active or in idle mode. In order to
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wake-up the MCU by an interrupt, the Low Frequency Timer (LFT) can be activated in ATA6870.
Interrupt is signaled with a high level on IRQ pin. The LFT is re-programmable on the fly and can
be reset through SPI, but is not stoppable.
Figure 7-2. ATA6870 in NORM Mode
ASICs in NOMode
Acquisition
Idle
IRQ
Asserted
Idle
SPI ACQ Cmd
Read status register Read data burst mode
MCU
Background
task
Send SPI
Command
Background
task/Idle
Interrupt
Handling
Background
task
Processing
9116B–AUTO–10/09
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ATA6870.PDF ] | |
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