AD7280

Preliminary Technical Data FEATURES 12-bit ADC, 1us per channel conversion time 6 Analog Input Channels, CM range 0.5V to 27.5V 6 Temperature Measurements Inputs. On Chip Voltage Regulator Cell Balancing Interface Daisy Chain Interface www.DataSheet4U.com 3 ppm Reference Low Quiescent Current High Input Impedance Serial Interface with Alert Function 1 SPI interface for up to 300 channels On Chip Registers for Channel Sequencing VDD Operating Range 7.5V to 30V Temperature Range -40 oC to 105oC 48 lead LQFP and LFCSP Packages Lithium Ion Battery Monitoring System AD7280 FUNCTIONAL BLOCK DIAGRAM V DD SCLKhi SDINhi SDOUThi ALERThi CShi PDhi CNVSThi CB1 CB6 AD7280 Vin(6) Vin(5) Vin(4) Vin(3) Vin(2) Vin(1) Vin(0) MUX + - DAIS Y CHAIN INTER FACE CEL L BALANCING INTER FACE REGUL ATOR VREG DGND DVCC + - 12 BIT ADC AVCC VDRIVE VT(6) VT(5) VT(4) VT(3) VT(2) VT(1) VT TERM CLOCK CONTRO L LOGIC & SELF TEST SCLK SDIN SDO UT ALERT CS PD CNVST MASTER VREF CREF REFGND 2.5V REF LIMIT REG SQN LOGIC DATA MEMO RY SPI INTER FACE VSS AGND APPLICATIONS Lithium Ion Battery Monitoring Nickel Metal Hydride Battery Monitoring Figure 1 GENERAL DESCRIPTION The AD72801 contains all the functions required for general purpose monitoring of stacked Lithium Ion batteries as used in Hybrid Electric Vehicles. The part has multiplexed analog input and temperature measurement channels for up to six cells of battery management. An internal 3-ppm reference is provided to drive the ADC. The ADC reso...