S9S12P64J0MFT Freescale Semiconductor, S9S12P64J0MFT Datasheet - Page 513
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S9S12P64J0MFT
Manufacturer Part Number
S9S12P64J0MFT
Description
MCU 64K FLASH AUTO 48-QFN
Manufacturer
Freescale Semiconductor
Series
HCS12r
Datasheet
1.S9S12P32J0MFT.pdf
(566 pages)
Specifications of S9S12P64J0MFT
Core Processor
HCS12
Core Size
16-Bit
Speed
32MHz
Connectivity
CAN, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
34
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.72 V ~ 5.5 V
Data Converters
A/D 10x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
48-QFN Exposed Pad
Processor Series
S12P
Core
HCS12
3rd Party Development Tools
EWHCS12
Development Tools By Supplier
KIT33812ECUEVME, DEMO9S12PFAME
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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A.2.2
Source resistance, source capacitance and current injection have an influence on the accuracy of the ATD.
A further factor is that PortAD pins that are configured as output drivers switching.
A.2.2.1
PortAD output drivers switching can adversely affect the ATD accuracy whilst converting the analog
voltage on other PortAD pins because the output drivers are supplied from the VDDA/VSSA ATD supply
pins. Although internal design measures are implemented to minimize the affect of output driver noise, it
is recommended to configure PortAD pins as outputs only for low frequency, low load outputs. The impact
on ATD accuracy is load dependent and not specified. The values specified are valid under condition that
no PortAD output drivers switch during conversion.
A.2.2.2
Due to the input pin leakage current as specified in
resistance there will be a voltage drop from the signal source to the ATD input. The maximum source
resistance R
leakage current. If device or operating conditions are less than worst case or leakage-induced error is
acceptable, larger values of source resistance of up to 10Kohm are allowed.
A.2.2.3
When sampling an additional internal capacitor is switched to the input. This can cause a voltage drop due
to charge sharing with the external and the pin capacitance. For a maximum sampling error of the input
voltage ≤ 1LSB (10-bit resilution), then the external filter capacitor, C
A.2.2.4
There are two cases to consider.
Freescale Semiconductor
1. A current is injected into the channel being converted. The channel being stressed has conversion
2. Current is injected into pins in the neighborhood of the channel being converted. A portion of this
values of $3FF (in 10-bit mode) for analog inputs greater than V
V
current is picked up by the channel (coupling ratio K), This additional current impacts the accuracy
of the conversion depending on the source resistance.
The additional input voltage error on the converted channel can be calculated as:
with I
RL
Factors Influencing Accuracy
S
unless the current is higher than specified as disruptive condition.
INJ
Port AD Output Drivers Switching
Source Resistance
Source Capacitance
Current Injection
specifies results in an error (10-bit resolution) of less than 1/2 LSB (2.5 mV) at the maximum
V
being the sum of the currents injected into the two pins adjacent to the converted channel.
ERR
= K * R
S
* I
INJ
S12P-Family Reference Manual, Rev. 1.13
Table A-6
and
Table A-7
f
≥ 1024 * (C
RH
in conjunction with the source
and $000 for values less than
INS
Electrical Characteristics
–C
INN
).
513
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