MC9S08AW48CFDE Freescale Semiconductor, MC9S08AW48CFDE Datasheet - Page 257
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MC9S08AW48CFDE
Manufacturer Part Number
MC9S08AW48CFDE
Description
IC MCU 48K FLASH 48-QFN
Manufacturer
Freescale Semiconductor
Series
HCS08r
Specifications of MC9S08AW48CFDE
Core Processor
HCS08
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
38
Program Memory Size
48KB (48K x 8)
Program Memory Type
FLASH
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
48-QFN
Processor Series
S08AW
Core
HCS08
Data Bus Width
8 bit
Data Ram Size
2 KB
Interface Type
I2C/SCI/SPI
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
38
Number Of Timers
6
Operating Supply Voltage
- 0.3 V to + 5.8 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWS08
Development Tools By Supplier
DEMO9S08AW60E
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
Package
48QFN EP
Family Name
HCS08
Maximum Speed
40 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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14.7.2
Several sources of error exist for A/D conversions. These are discussed in the following sections.
14.7.2.1
For proper conversions, the input must be sampled long enough to achieve the proper accuracy. Given the
maximum input resistance of approximately 7kΩ and input capacitance of approximately 5.5 pF, sampling
to within 1/4
8 MHz maximum ADCK frequency) provided the resistance of the external analog source (R
below 5 kΩ.
Higher source resistances or higher-accuracy sampling is possible by setting ADLSMP (to increase the
sample window to 23.5 cycles) or decreasing ADCK frequency to increase sample time.
14.7.2.2
Leakage on the I/O pins can cause conversion error if the external analog source resistance (R
If this error cannot be tolerated by the application, keep R
1/4
14.7.2.3
System noise which occurs during the sample or conversion process can affect the accuracy of the
conversion. The ADC accuracy numbers are guaranteed as specified only if the following conditions are
met:
There are some situations where external system activity causes radiated or conducted noise emissions or
excessive V
wait or stop3 or I/O activity cannot be halted, these recommended actions may reduce the effect of noise
on the accuracy:
Freescale Semiconductor
LSB
•
•
•
•
•
•
•
leakage error (N = 8 in 8-bit mode or 10 in 10-bit mode).
There is a 0.1 μF low-ESR capacitor from V
There is a 0.1 μF low-ESR capacitor from V
If inductive isolation is used from the primary supply, an additional 1 μF capacitor is placed from
V
V
Operate the MCU in wait or stop3 mode before initiating (hardware triggered conversions) or
immediately after initiating (hardware or software triggered conversions) the ADC conversion.
— For software triggered conversions, immediately follow the write to the ADC1SC1 with a
— For stop3 mode operation, select ADACK as the clock source. Operation in stop3 reduces V
There is no I/O switching, input or output, on the MCU during the conversion.
Place a 0.01 μF capacitor (C
improve noise issues but will affect sample rate based on the external analog source resistance).
DDAD
SSAD
WAIT instruction or STOP instruction.
noise but increases effective conversion time due to stop recovery.
DD
Sources of Error
LSB
Sampling Error
Pin Leakage Error
Noise-Induced Errors
(and V
noise is coupled into the ADC. In these situations, or when the MCU cannot be placed in
to V
(at 10-bit resolution) can be achieved within the minimum sample window (3.5 cycles @
SSAD
REFL
.
, if connected) is connected to V
AS
MC9S08AW60 Data Sheet, Rev 2
) on the selected input channel to V
REFH
DDAD
AS
to V
to V
SS
lower than V
at a quiet point in the ground plane.
Chapter 14 Analog-to-Digital Converter (S08ADC10V1)
REFL
SSAD
.
.
DDAD
REFL
/ (2
or V
N
*I
SSAD
LEAK
(this will
) for less than
AS
AS
) is kept
) is high.
DD
257
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