mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 168

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

1
Analog-to-Digital Converter (ADC12V1)
9.1.2.2
The ADC is capable of performing conversions using the MCU bus clock, the bus clock divided by two,
the local asynchronous clock (ADACK) within the module, or the alternate clock (ALTCLK). The
ALTCLK on this device is the MCGERCLK. See
(MCGV3),” for more information.
9.1.2.3
The ADC module includes a temperature sensor whose output is connected to one of the ADC analog
channel inputs.
where:
For temperature calculations, use the V
In application code, the user reads the temperature sensor channel, calculates V
V
less than V
9-2
ADCH
01001
01010
01011
01100
01101
01110
01111
For information, see
TEMP25
— V
— V
— m is the hot or cold voltage versus temperature slope in V/°C.
. If V
Channel
AD10
AD11
AD12
AD13
AD14
AD15
TEMP25
AD9
TEMP
TEMP25
Alternate Clock
Temperature Sensor
TEMP
Selecting the internal bandgap channel requires SPMSC1[BGBE] to be set
(see
Register
Equation 9-1
Section 9.1.2.3, “Temperature
is the voltage of the temperature sensor channel at the ambient temperature.
the hot slope value is applied in
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
Section 5.9.7, “System Power Management Status and Control 1
is greater than V
is the voltage of the temperature sensor channel at 25°C.
PTD2/AD1P10
PTD3/AD1P11
PTD4/AD1P12
PTD5/AD1P13
PTD6/AD1P14
PTD7/AD1P15
(SPMSC1)”). See data sheet for the value of the bandgap voltage.
PTD1/AD1P9
Input
Table 9-1. ADC Channel Assignment (continued)
provides an approximate transfer function of the temperature sensor.
Temp = 25 – ((V
TEMP25
TEMP25
Pin Control
ADPC10
ADPC11
ADPC12
ADPC13
ADPC14
ADPC15
Sensor.”
ADPC9
the cold slope value is applied in
TEMP
and m values in the data sheet.
NOTE
Chapter 16, “Multipurpose Clock Generator
– V
Equation
TEMP25
ADCH
11001
11010
11011
11100
11101
11110
11111
) ÷ m)
9-1.
Channel
Disabled
Module
V
V
AD26
AD27
AD25
REFH
REFL
—
Internal Bandgap
Equation
TEMP
Temperature
Reserved
Reserved
Sensor
V
V
Input
None
REFH
REFL
Freescale Semiconductor
, and compares to
1
9-1. If V
Pin Control
TEMP
Eqn. 9-1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
is