UPD78F0513AMC-GAA-AX Renesas Electronics America, UPD78F0513AMC-GAA-AX Datasheet - Page 429

• Manufacturer Part Number: UPD78F0513AMC-GAA-AX
• Description: MCU 8BIT 38PIN SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2r

Specifications of UPD78F0513AMC-GAA-AX

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 31
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

78K0/Kx2
(5) ANI0/P20 to ANI7/P27
(6) Input impedance of ANI0 to ANI7 pins
(7) AV
R01UH0008EJ0401 Rev.4.01
Jul 15, 2010
<1> The analog input pins (ANI0 to ANI7) are also used as I/O port pins (P20 to P27).
<2> If a digital pulse is applied to the pins adjacent to the pins currently used for A/D conversion, the expected value
This A/D converter charges a sampling capacitor for sampling during sampling time.
Therefore, only a leakage current flows when sampling is not in progress, and a current that charges the capacitor
flows during sampling. Consequently, the input impedance fluctuates depending on whether sampling is in progress,
and on the other states.
To make sure that sampling is effective, however, it is recommended to keep the output impedance of the analog
input source to within 10 kΩ, and to connect a capacitor of about 100 pF to the ANI0 to ANI7 pins (see Figure 13-20).
A series resistor string of several tens of kΩ is connected between the AV
Therefore, if the output impedance of the reference voltage source is high, this will result in a series connection to the
series resistor string between the AV
Remark ANI0 to ANI3: 78K0/KB2
Reference
C = 100 to 1,000 pF
REF
voltage
When A/D conversion is performed with any of ANI0 to ANI7 selected, do not access P20 to P27 while
conversion is in progress; otherwise the conversion resolution may be degraded. It is recommended to select
pins used as P20 to P27 starting with the ANI0/P20 that is the furthest from AV
of the A/D conversion may not be obtained due to coupling noise. Therefore, do not apply a pulse to the pins
adjacent to the pin undergoing A/D conversion.
pin input impedance
input
ANI0 to ANI5: 38-pin products of the 78K0/KC2
ANI0 to ANI7: Products other than above
Figure 13-20. Analog Input Pin Connection
REF
and AV
SS
AV
AV
V
ANI0 to ANI7
SS
pins, resulting in a large reference voltage error.
REF
SS
If there is a possibility that noise equal to or higher than AV
equal to or lower than AV
small V
F
value (0.3 V or lower).
REF
SS
and AV
may enter, clamp with a diode with a
CHAPTER 13 A/D CONVERTER
REF
SS
pins.
.
REF
or
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