MM912H634CV1AE Freescale Semiconductor, MM912H634CV1AE Datasheet - Page 144

• Manufacturer Part Number: MM912H634CV1AE
• Description: 64KS12 LIN2xLS/HS Isense
• Manufacturer: Freescale Semiconductor
• Series: -r

Specifications of MM912H634CV1AE

• Applications: Automotive
• Core Processor: HCS12
• Program Memory Type: FLASH (64 kB)
• Controller Series: HCS12
• Ram Size: 6K x 8
• Interface: LIN
• Number Of I /o: -
• Voltage - Supply: 5.5 V ~ 27 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.23
The reverse battery protected VSENSE pin has been implemented to allow a direct measurement of the Battery
level voltage. Bypassing the device VSUP capacitor and external reverse battery diode will detect under-voltage
conditions without delay. A series resistor is required to protect the MM912_634 analog die from fast transients.
The voltage present on the VSENSE pin can be routed via an internal divider to the internal Analog Digital Converter or issue an
interrupt (LBI) to alert the MCU.
For the interrupt based alert, see
Section 4.20, “Analog Digital Converter -
4.24
In addition to the VSENSE module, the internal VS1 supply can be routed to the analog digital converter as well. See
Section 4.20, “Analog Digital Converter - ADC
4.25
The internal reference bandgap voltage “bg1p25sleep” is generated fully independent from the Analog Digital Converter
reference voltages.
Measuring
ADCH14 under normal conditions. Any result outside the range would indicate faulty behavior of either the ADC chain
or the 2p5sleep Bandgap circuity.
Note:
Freescale Semiconductor
136.
I
The maximum allowed sample frequency for Channel 14 is limited to fCH14. Increasing the sample frequency above can result in
unwanted turn off of the LS drivers due to a false VREG over-voltage.
(136)
Supply Voltage Sense - VSENSE
Internal Supply Voltage Sense - VS1SENSE
Internal Bandgap Reference Voltage Sense - BANDGAP
the “bg1p25sleep” reference through the ADC-CH14 allows should return a conversion result within
R
R
VSENSE
VSENSE
Section 4.5, “Power
VSENSE
VS1
VS2
VSENSE
VS1
VS2
ADC.
MM912_634 Advance Information, Rev. 4.0
for details on the acquisition.
Figure 40. VS1Sense Module
Figure 39. VSENSE Module
RATIO
Prescaler
Prescaler
RATIO
LBI
Supply. For VSENSE measurement using the internal ADC see
VSENSE
LVI
VS1
CH11
CH12
ADC
ADC
Supply Voltage Sense - VSENSE
MCU
MCU
MCU
ANALOG
ANALOG
ANALOG
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