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Li-Ion, NiMH Battery Measuring, Charge Balancing and Power-supply Circuit
● 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 10µA standby current ● Low cell imbalance current < 10µA ● 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 7mm x7mm
● Battery measurement, supply and monitoring IC for Li-ion and NiMH battery systems in Electric EV and Hybrid Electrical HEV Vehicles
● Electrical and hybrid electrical vehicles ● Li-Ion batteries as 12V lead-acid battery replacement ● Ebike, scooters ● Uninterruptible power supply UPS ● Smart grid
● Cost reduction due to integrated measurement circuit and high voltage power-supply
The ATA6870N is a measurement and monitoring circuit designed for Li-ion and NiMH multicell battery stacks in hybrid electrical vehicles.
The Atmel ATA6870N 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-shifters with current sources. The Atmel ATA6870N 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.
Figure Block Diagram
To ATA6870 above
Cell 6 Reference
ADC Cell Balancing
DISCH1 MBAT1 TEMPREF
Cell 1 Reference
ADC Cell Balancing
Cell Temperature Measuring
Digital Level Shifter Test
Digital Level Shifter
Digital Level Shifter
3.3V Voltage Regulator
3.3V Internal Voltage Regulator
Extended Type Number ATA6870N-PLPW ATA6870N-PLQW
Top View D
PIN 1 ID
Package QFN48, 7 x 7 QFN48, 7 x 7
MOQ 1,000 pieces 4,000 pieces
technical drawings according to DIN specifications
Dimensions in mm
Standard Singulation process
Bottom View D2
36 37 e
COMMON DIMENSIONS Unit of Measure = mm
Symbol MIN NOM MAX NOTE
Package Drawing Contact:
Package VQFN_7x7_48L Exposed pad 5.6x5.6
48 ATA6870N [DATASHEET]
As a minimum, the devices will be marked with the following ● Date code year and week number ● part number ATA6870N
• Put datasheet in the latest template
1600 Technology Drive, San Jose, CA 95110 USA
T +1 408
F +1 408
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