MM912H634DM1AER2 Freescale Semiconductor, MM912H634DM1AER2 Datasheet - Page 153

• Manufacturer Part Number: MM912H634DM1AER2
• Description: 16-bit Microcontrollers - MCU 64KS12 LIN2XLS/HS ISENSE
• Manufacturer: Freescale Semiconductor

Specifications of MM912H634DM1AER2

• Rohs: yes
• Core: HCS12
• Processor Series: MM912F634
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 20 MHz
• Program Memory Size: 32 KB
• Data Ram Size: 2 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 5.5 V to 18 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: LQFP-48
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 15
• Interface Type: SPI
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 15
• Number Of Timers: 1
• Program Memory Type: Flash
• Supply Voltage - Max: 18 V
• Supply Voltage - Min: 5.5 V

Functional Description and Application Information
4.22
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 MM912F634 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 4.19, “Analog Digital Converter -
4.23
In addition to the VSENSE module, the internal VS1 supply can be routed to the analog digital converter as well. See
Section 4.19, “Analog Digital Converter - ADC"
4.24
The internal reference bandgap voltage “bg1p25sleep” is generated fully independent from the Analog Digital Converter
reference voltages. Measuring
within AD
the 2p5sleep Bandgap circuity.
Note:
Freescale Semiconductor
141.
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.
CH14
Supply Voltage Sense - VSENSE
Internal Supply Voltage Sense - VS1SENSE
Internal Bandgap Reference Voltage Sense - BANDGAP
under normal conditions. Any result outside the range would indicate faulty behavior of either the ADC chain or
Due to internal capacitor charging, temperature measurements are valid 200 ms (max) after
system power up and wake-up.
(141)
R
R
VSENSE
VSENSE
Section 4.4, “Power
the “bg1p25sleep” reference through the ADC-CH14 allows should return a conversion result
ADC".
VSENSE
VS1
VS2
VSENSE
VS1
VS2
for details on the acquisition.
Figure 42. VS1Sense Module
Figure 41. VSENSE Module
Supply". For VSENSE measurement using the internal ADC see
RATIO
Prescaler
Prescaler
RATIO
NOTE
LBI
VSENSE
LVI
VS1
CH11
CH12
ADC
Supply Voltage Sense - VSENSE
ADC
MM912F634
153