UPD78F0551MA-FAA-AX Renesas Electronics America, UPD78F0551MA-FAA-AX Datasheet - Page 445

• Manufacturer Part Number: UPD78F0551MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0551MA-FAA-AX

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: I²C, LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 9
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

78K0/Kx2-L
(5) ANI0/P20 to ANI7/P27, ANI8/P10 to ANI10/P12, and ANI8/P70 to ANI10/P72
(6) Input impedance of ANI0 to ANI10 pins
(7) AV
R01UH0028EJ0400 Rev.4.00
Sep 27, 2010
<1> The analog input pins (ANI0 to ANI7 and ANI8 to ANI10) are also used as digital I/O port pins (P20 to P27 and
<2> To use the ANI0/P20 to ANI7/P27 and ANI8/P10 to ANI10/P12 pins for digital I/O port, it is recommended to use
<3> 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 flow 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 ANI10 pins (refer to Figure
12-22).
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
Reference
C = 100 to 1,000 pF
REF
voltage
P10 to P12). When A/D conversion is performed with any of ANI0 to ANI7 and ANI8 to ANI10 selected, do not
access P20 to P27 while conversion is in progress; otherwise the conversion resolution may be degraded.
starting with the furthest pin from AV
as analog input, it is recommended to use starting with the closest pin to AV
the 78K0/KC2-L (44-pin and 48-pin products)).
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
Figure 12-22. Analog Input Pin Connection
REF
and AV
REF
(for example, the ANI0/P20 pin in the 78K0/KC2-L). To use these pins
SS
AV
ANI0 to ANI10
AV
V
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 12 A/D CONVERTER
SS
(for example, the ANI7/P27 pin in
SS
pins.
REF
or
431