
4 Power Supply Voltage
4-2
EPSON
S1C17003 TECHNICAL MANUAL
4.2 Operating Voltage (LVDD, VSS)
The core CPU and internal logic circuits of the S1C17003 operate with a voltage supplied between the LVDD and
VSS pins.
The following operating voltage can be used:
LVDD = 1.65 V to 1.95 V (1.80 V
± 0.15 V, VSS = GND)
Note: The S1C17003 TQFP package has five LVDD pins and nine VSS pins; the WCSP package has two
LVDD pins and three VSS pins. Be sure to supply the operating voltage to all the pins. Do not open
any of them.
4.3 Power Supply for I/O Interface (HVDD)
The HVDD voltage is used for interfacing with external I/O signals. For the output interface of the S1C17003, the
HVDD voltage is used as high level and the VSS voltage as low level. The VSS pin is used for the ground common
with LVDD. The following voltage is enabled for HVDD:
HVDD = 1.65 V to 3.60 V (VSS = GND)
Notes: The S1C17003 TQFP package has five HVDD pins; the WCSP package has two HVDD pins. Be
sure to supply the operating voltage to all the pins. Do not open any of them.
When an external clock is input to the OSC3 or OSC1 pin, the clock signal level must be LVDD.
4.4 Power Supply for Analog Circuits (AVDD)
The analog power supply pin (AVDD) is provided separately from the LVDD and HVDD pins in order that the digital
circuits do not affect the analog circuit (A/D converter). The AVDD pin is used to supply an analog power voltage
and the VSS pin is used as the analog ground.
The following voltage is enabled for AVDD:
AVDD = 2.70 V to 3.60 V or 1.65 V to 3.60 V (Note) (VSS = GND)
Notes: Be sure to supply a voltage within the range from 1.65 to 3.60 V to the AVDD pin even if the
analog circuit is not used. It is not necessary to supply a voltage same as the HVDD level.
The AVDD voltage range can be changed to 1.65 to 3.60 V only when the ADC is not used and
the P0x pins are used as digital signal input pins, not analog input pins. However, the high and
low level input voltages of the digital signals must be AVDD and GND, respectively.
Noise on the analog power lines decrease the A/D converting precision, so use a stabilized power supply and make
the board pattern with consideration given to that.