
Rev.1.01
Aug 02, 2004
page 3 of 96
7517 Group
VCC, VSS
AVCC
AVSS
ADVSS
ADVREF
CNVSS
RESET
XIN
XOUT
P00/SIN2
P01/SOUT2
P02/SCLK2
P03/SRDY2
P04/AN8–P07/AN11
P10–P17
P20/XCOUT
P21/XCIN
P22/SDA1
P23/SCL1
P24/SDA2/RxD
P25/SCL2/TxD
P26/SCLK
P27/CNTR0/
SRDY1
P30/AN0–
P35/AN5
P40/CNTR1
P41/INT0
P42/INT1
P43/INT2/SCMP2
P44/INT3/PWM
P45/DFETCNT
ISENS0
ISENS1
PIN DESCRIPTION
Functions
Name
Pin
Apply voltage of 3.3V to Vcc, and 0 V to Vss.
Apply voltage of 3.3V to AVcc, and 0 V to AVss and ADVss.
Reference voltage input pin for A/D converter.
This pin controls the operation mode of the chip.
Normally connected to VSS.
Reset input pin for active “L”.
Input and output pins for the clock generating circuit.
Connect a ceramic resonator or quartz-crystal oscillator between the XIN and XOUT pins to set
the oscillation frequency.
When an on-chip oscillator is used, leave the XIN pin and XOUT pin open.
When an external clock is used, connect the clock source to the XIN pin and leave the XOUT
pin open.
8-bit CMOS I/O port.
I/O direction register allows each pin to be individually
programmed as either input or output.
CMOS compatible input level.
CMOS 3-state output structure.
P10 to P17 (8 bits) are enabled to output large current for LED drive.
Power source
Table 1 Pin description
Function except a port function
Analog power
source
Analog reference
voltage
CNVSS input
Reset input
Clock input
Clock output
 Serial I/O2 function pin
 Sub-clock generating circuit I/O
pins (connect a resonator)
 I2C-BUS interface function pin/
Serial I/O1 function pin
 Serial I/O1 function pin
 Serial I/O1 function pin/
Timer X function pin
 A/D converter input pin
8-bit CMOS I/O port.
I/O direction register allows each pin to be individually
programmed as either input or output.
CMOS compatible input level.
P22 to P25 can be switched between CMOS compat-
ible input level or SMBUS input level in the I2C-BUS
interface function.
P20, P21, P24 to P27: CMOS3-state output structure.
P24, P25: N-channel open-drain structure in the I2C-
BUS interface function.
P22, P23: N-channel open-drain structure.
 I2C-BUS interface function pin
8-bit CMOS I/O port with the same function as port P0.
CMOS compatible input level.
CMOS 3-state output structure.
6-bit CMOS I/O port with the same function as port P0.
CMOS compatible input level.
CMOS 3-state output structure.
 A/D converter input pin
 Timer Y function pin
 Interrupt input pin
 Interrupt input pin/SCMP2 output pin
 Interrupt input pin/PWM output pin
 Over current detector function pin
Input pins for the current integrator and the over current detector. Connect these pins at both
ends of a detection resistor, and connect ISENS0 to GND.
I/O port P0
I/O port P1
I/O port P2
I/O port P3
I/O port P4
Analog input