Preliminary Technical Data
FEATURES
12-bit ADC, 1us per channel conversion time 6 Analog Input Channels, CM range 0.5V t...
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...