Freescale Semiconductor
Advance Information
Document Number: MM912_637D1
Rev. 3.0, 1/2012
Xtrinsic Battery Sensor with
LIN for 12 V Lead-acid
Batteries
Freescale's Xtrinsic MM912_637 battery sensors are fully
integrated battery monitoring devices. The devices allow
simultaneous measurement of battery current and voltage for
precise determination of SOC (State of Charge), SOH (State of
Health), and other parameters.
MM912_637
EP SUFFIX (PB-FREE)
98ASA00343D
48-PIN QFN
The integrated temperature sensor combined with the close proximity to the battery allows battery temperature measurement.
Multiple application-specific hardware blocks reduce MCU overhead and related power consumption. Configurable low-power
modes with automated battery state observation and sophisticated wake-up capability further reduce current consumption. The
integrated LIN 2.1 interface allows communication and control of battery monitoring functions.
Features
•
•
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•
•
•
•
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Battery voltage measurement
Battery current measurement in up to eight ranges
On chip temperature measurement
Normal and two low-power modes
Current threshold detection and current averaging in
standby => wake-up from low-power mode
Triggered wake-up from LIN and periodic wake-up
Signal low pass filtering (current, voltage)
PGA (programmable low-noise gain amplifier) with
automatic gain control feature
Accurate internal oscillator (an external quartz oscillator
may be used for extended accuracy)
• Communication via a LIN 2.1, LIN2.0 bus interface
• S12 microcontroller with 128 kByte flash, 6.0 kByte RAM,
4.0 kByte data flash
• Background debug module
• External temperature sensor option (TSUP, VTEMP)
• Optional 2nd external voltage sense input (VOPT)
• Four x 5.0 V GPIO including one Wake-up capable high
voltage input (PTB3/L0)
• Eight x MCU general purpose I/O including SPI functionality
• Industry standard EMC compliance
MM912_637
VDDA
ADC Supply
AGND
ADCGND
VDDL
VDDH
VDDD2D
VDDX
VDDRX
DGND
VSSD2D
VSSRX
RESET
RESET_A
PA0/MISO
PA1/MOSI
PA2/SCK
PA3/SS
PA4
PA5
PA6
PA7
BKGD/MODC
PE0/EXTAL
PE1/XTAL
TEST
LIN
(optional)
LGND
Internal
Temp
Sense
Module
TSUP
VTEMP
VOPT
VSENSE
VSUP
Battery
Negative Pole
_
Shunt
ISENSEH
PTB0
PTB1
PTB2
PTB3/L0
GNDSUB
TCLK
TEST_A
Analog Test
4
Chassis
Ground
-5.0 V GPI/O shared
with TIMER, SCI and LIN
-PTB3 high voltage
WAKE capable
Current Sense Module
Battery
Positive Pole
+
LIN Interface
Optional Temp Sense
Input and Supply
2.5 V Supply
5.0 V Supply
Voltage sense Module
Power Supply
Digital Ground
Reset
ISENSEL
5.0 V Digital I/O
Debug and External
Oscillator
MCU Test
Figure 1. Simplified Application Diagram
This document contains information on a product under development. Freescale reserves
the right to change or discontinue this product without notice.
© Freescale Semiconductor, Inc., 2010-2012. All rights reserved.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
