Datasheet

78K0/Kx2-L CHAPTER 12 A/D CONVERTER
R01UH0028EJ0400 Rev.4.00 402
Sep 27, 2010
Figure 12-1. Block Diagram of A/D Converter
INTAD
ADCS FR2 FR1 ADCEFR0
AVSS
5
ANI0/P20
ANI1/AMP0OUT
Note 1
/RGAIN
Note 1
/P21
ANI2/P22
ANI3/P23
ANI4/P24
ANI5/P25
ANI6/P26
ANI7/P27
ANI8/P10
ANI9/AMP1OUT
Note 2
/P11
ANI10/P12
Comparison voltage
generator
LV1 LV0
5
ADS3 ADS2 ADS1 ADS0
ADOAS
AVREF
AVSS
PGA output signal (PGAIN)
Note 1
ADPC0
8
ADPC3 ADPC2 ADPC1ADPC4ADPC5ADPC6ADPC7
ADPC8
3
ADPC10 ADPC9
Selector
Selector
Sample & hold circuit
A/D voltage comparator
ADCS bit
ADCE bit
Successive
approximation
register (SAR)
Controller
A/D conversion
result register
(ADCR, ADCRL, ADCRH)
A/D converter mode
register 0 (ADM0)
Analog input channel
specification register (ADS)
A/D port configuration
register 0 (ADPC0)
A/D port configuration
register 1 (ADPC1)
Internal bus
Notes 1. Products with operational amplifier only
2. Products with operational amplifier of 78K0/KB2-L and 78K0/KC2-L only
Caution In the 78K0/KY2-L and 78K0/KA2-L, V
SS functions alternately as the ground potential of the A/D
converter. Be sure to connect VSS to a stabilized GND (= 0 V).
Remark A/D converter analog input pins differ depending on products.
• 78K0/KY2-L: ANI0 to ANI3
• 78K0/KA2-L (20-pin products): ANI0 to ANI5
• 78K0/KA2-L (25-pin products): ANI0 to ANI6
• 78K0/KA2-L (32-pin products): ANI0 to ANI10
• 78K0/KB2-L: ANI0 to ANI3, ANI8 to ANI10
• 78K0/KC2-L (40-pin product): ANI0 to ANI6, ANI8 to ANI10
• 78K0/KC2-L (44-pin and 48-pin products): ANI0 to ANI10
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