UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 298
UPD78F0034BGC-8BS-A
Manufacturer Part Number
UPD78F0034BGC-8BS-A
Description
MCU 8-Bit 78K0 CISC 32KB Flash 2.5V/3.3V/5V 64-Pin LQFP
Manufacturer
Renesas Electronics America
Datasheet
1.UPD78F0034BGK-9ET-A.pdf
(605 pages)
Specifications of UPD78F0034BGC-8BS-A
Package
64LQFP
Family Name
78K0
Maximum Speed
12 MHz
Ram Size
1 KB
Program Memory Size
32 KB
Operating Supply Voltage
2.5|3.3|5 V
Data Bus Width
8 Bit
Program Memory Type
Flash
Number Of Programmable I/os
51
Interface Type
3-Wire/UART
On-chip Adc
8-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
3
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Part Number:
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(12) AV
(13) Internal equivalent circuit of ANI0 to ANI7 pins and permissible signal source impedance
Remark C1: 4.7 F to 10 F (reference value)
Remark n = 0 to 7
Connect a capacitor to the AV
has been stopped and then is started, the voltage applied to the AV
accuracy of the A/D conversion to drop. To prevent this, also connect a capacitor to the AV
Figure 14-19 shows an example of connecting a capacitor.
To complete sampling within the sampling time with sufficient A/D conversion accuracy, the impedance of the
signal source such as a sensor must be sufficiently low. Figure 14-20 shows the internal equivalent circuit of
the ANI0 to ANI7 pins.
If the impedance of the signal source is high, connect capacitors with a high capacitance to the pins ANI0 to ANI7.
An example of this is shown in Figure 14-21. In this case, however, the microcontroller cannot follow an analog
signal with a high differential coefficient because a lowpass filter is created.
To convert a high-speed analog signal or to convert an analog signal in the scan mode, insert a low-impedance
buffer.
REF
pin
C2: 0.01 F to 0.1 F (reference value)
Connect C2 as close to the pin as possible.
CHAPTER 14 10-BIT A/D CONVERTER ( PD780034A, 780034AY SUBSERIES)
Figure 14-20. Internal Equivalent Circuit of Pins ANI0 to ANI7
Figure 14-19. Example of Connecting Capacitor to AV
ANIn
C
1
REF
pin to minimize conversion errors due to noise. If an A/D conversion operation
C1
User’s Manual U14046EJ5V0UD
R1
C
2
C2
AV
AV
AV
Clamp using a diode with a low
V
F
DD
REF
SS
(0.3 V or lower).
R2
REF
pin becomes unstable, causing the
REF
Pin
C3
REF
pin.
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