S9S08SG8E2VTJR Freescale Semiconductor, S9S08SG8E2VTJR Datasheet - Page 131

• Manufacturer Part Number: S9S08SG8E2VTJR
• Description: 8-bit Microcontrollers - MCU 9S08 UC W/ 8K 0.25UM SGF
• Manufacturer: Freescale Semiconductor

Specifications of S9S08SG8E2VTJR

• Rohs: yes
• Core: HCS08
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 40 MHz
• Program Memory Size: 8 KB
• Data Ram Size: 512 B
• On-chip Adc: Yes
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: TSSOP-20
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 12
• Interface Type: I2C, SCI, SPI
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 16
• Number Of Timers: 3
• Program Memory Type: Flash
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.7 V

Equation 9-1
where:
For temperature calculations, use the V
In application code, the user reads the temperature sensor channel, calculates V
V
less than V
calibrate the bandgap voltage reference and temperature sensor.
Calibrating at 25°C will improve accuracy to
Calibration at three points, -40°C, 25°C, and 125°C will improve accuracy to ± 2.5°C. Once calibration
has been completed, the user will need to calculate the slope for both hot and cold. In application code, the
user would then calculate the temperature using
temperature is above or below 25°C. Once determined if the temperature is above or below 25°C, the user
can recalculate the temperature using the hot or cold slope value obtained during calibration.
Freescale Semiconductor
TEMP25
— By using the calculated value of V
— V
— V
— m is the hot or cold voltage versus temperature slope in V/°C.
. If V
TEMP25
TEMP
TEMP25
provides an approximate transfer function of the temperature sensor.
TEMP
is the voltage of the temperature sensor channel at the ambient temperature.
the hot slope value is applied in
is greater than V
is the voltage of the temperature sensor channel at 25°C.
Temp = 25 - ((V
TEMP25
MC9S08SG32 Data Sheet, Rev. 8
TEMP25
the cold slope value is applied in
±
DD
TEMP
4.5°C.
and m values from the ADC Electricals table.
Equation 9-1
, convert the digital value of AD26 into a voltage,
-V
Equation
TEMP25
) ÷ m)
9-1. To improve accuracy the user should
as detailed above and then determine if the
Chapter 9 Analog-to-Digital Converter (S08ADC10V1)
Equation
TEMP
, and compares to
9-1. If V
TEMP
Eqn. 9-1
V
TEMP
125
is