UPD78F1009GB-GAH-AX Renesas Electronics America, UPD78F1009GB-GAH-AX Datasheet - Page 577

• Manufacturer Part Number: UPD78F1009GB-GAH-AX
• Description: MCU 16BIT 78K0R/KX3-L 64-LQFP
• Manufacturer: Renesas Electronics America
• Series: 78K0R/Kx3-Lr

Specifications of UPD78F1009GB-GAH-AX

• Core Processor: 78K/0R
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: DMA, LVD, POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Ram Size: 3K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

78K0R/Kx3-L
(5) ANI0/P20 to ANI7/P27 and ANI8/P150 to ANI15/P157 pins
(6) Input impedance of ANI0 to ANI15 pins
(7) AV
R01UH0106EJ0300 Rev.3.00
Oct 01, 2010
Remark P20/ANI0 to P27/ANI7, P150/ANI8, P151/ANI9:
<1> The analog input pins (ANI0 to AN15) are also used as input port pins (P20 to P27, P150 to P157).
<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 1 kΩ, and to connect a capacitor of about 100 pF to the ANI0 to ANI15 pins (see Figure 13-22).
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
When A/D conversion is performed with any of the ANI0 to ANI15 pins selected, do not access P20 to P27 and
P150 to P157 while conversion is in progress; otherwise the conversion resolution may be degraded. It is
recommended to select pins used as P20 to P27 and P150 to P157 starting with the ANI0/P20 pin 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
P20/ANI0 to P27/ANI7, P150/ANI8 to P152/ANI10: 78K0R/KC3-L (48-pin) and 78K0R/KD3-L
P20/ANI0 to P27/ANI7, P150/ANI8 to P153/ANI11: 78K0R/KE3-L, 78K0R/KF3-L
P20/ANI0 to P27/ANI7, P150/ANI8 to P157/ANI15: 78K0R/KG3-L
REF
.
Figure 13-22. Analog Input Pin Connection
REF
and AV
SS
AV
AV
V
ANI0 to ANI15
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
78K0R/KC3-L (40-pin, 44-pin)
value (0.3 V or lower).
REF
SS
and AV
may enter, clamp with a diode with a
CHAPTER 13 A/D CONVERTER
SS
pins.
REF
or
577