UPD78F0550MA-FAA-AX Renesas Electronics America, UPD78F0550MA-FAA-AX Datasheet - Page 395

• Manufacturer Part Number: UPD78F0550MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0550MA-FAA-AX

• Package / Case: *
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Speed: 10MHz
• Number Of I /o: 12
• Core Processor: 78K/0
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Program Memory Size: 4KB (4K x 8)
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Peripherals: LVD, POR, PWM, WDT
• Connectivity: I²C, LIN, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(5) ANI0/P20 to ANI7/P27 and ANI8/P10 to ANI10/P12
(6) Input impedance of ANI0 to ANI10 pins
(7) AV
<1> The analog input pins (ANI0 to ANI7 and ANI8 to ANI10) are also used as digital I/O port pins (P20 to P27
<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
<3> If a digital pulse is applied to the pins adjacent to the pins currently used for A/D conversion, the expected
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 k , 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 k 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
input
and 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.
use starting with the furthest pin from AV
these pins as analog input, it is recommended to use starting with the closest pin to AV
ANI7/P27 pin in the 78K0/KC2-L).
value 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
Figure 12-22. Analog Input Pin Connection
Preliminary User’s Manual U19111EJ2V1UD
CHAPTER 12 A/D CONVERTER
REF
and AV
AV
ANI0 to ANI10
AV
V
REF
SS
REF
SS
If there is a possibility that noise equal to or higher than AV
equal to or lower than AV
small V
SS
(for example, the ANI0/P20 pin in the 78K0/KC2-L). To use
pins, resulting in a large reference voltage error.
F
value (0.3 V or lower).
SS
REF
may enter, clamp with a diode with a
and AV
SS
pins.
SS
(for example, the
REF
or
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