ATA6870N-PLPW Microchip

ATA6870N Li-Ion, NiMH Battery Measuring, Charge Balancing and Power-supply Circuit DATASHEET 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 10A standby current Low cell imbalance current (< 10A) 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 7mm Applications 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 Benefits Cost reduction due to integrated measurement circuit and high voltage power-supply 9317D-AUTO-07/151. Description The Atmel 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. 2. Block Diagram Figure 2-1. Block Diagram To ATA6870 above VDDHV MBAT7 PD_N Standby Control PD_N_OUT Cell 6: Reference VDDHVP ADC Cell Balancing DISCH6 3.3V POW_ENA Voltage Regulator MBAT6 VDDHVM AVDD 3.3V Internal MBAT2 DVDD Voltage Regulator BIASRES Cell 1: Reference Internal Biasing ADC Cell Balancing DISCH1 MBAT1 MISO_IN MOSI_OUT TEMPREF SCK_OUT CS_N_OUT Interchip CLK_OUT and IRQ_IN TEMP2 Cell Microcontroller TEMP1 Temperature Communication CS_N Measuring Interface SCK NTC NTC MOSI MCU MISO IRQ TEMPVSS CLK GND AVSS DVSS SCANMODE DTST VDDFUSE MFIRST PWTST CS_FUSE ATST To ATA6870 below 2 ATA6870N [DATASHEET] 9317DAUTO07/15 Digital Digital Digital Level Shifter Level Shifter Level Shifter Test Logic