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2 POWER SUPPLY BLOCK AND INITIAL RESET
2
Power Supply Block and Initial Reset
2.1 Power Supply
The following shows the operating power supply voltage of the S1C05251.
Power supply voltage: 2.7 V to 5.5 V
The S1C05251 is operated in the above voltage range by a single power supply that is connected between V
V
. The voltage required for internal operation (V
SS
External
power
supply
2.2 Initial Reset
The S1C05251 contains control registers that can be accessed by the external CPU through a serial interface. The
control registers are initialized by an initial reset which is applied from the #RESET pin.
Specifically, the control registers are reset by pulling the #RESET pin to Low level (V
Then, the reset state is eliminated by releasing the #RESET pin back to High level (V
circuit for the control register is reset when the #RESET pin or MODE0 pin is at Low level. Before data can be
written to the control register, both #RESET and MODE0 must be at High level.
6
REF
V
DD
+
V
REF
–
V
SS
Figure 2.1.1 Power supply block
Control register
#RESET
MODE0
Figure 2.2.1 Initial reset circuit
= 1/2 V
) is generated by the IC itself.
DD
+
–
Write control circuit
R
R
EPSON
DD
R
R
) from outside of the IC.
S S
). Also, the write control
DD
S1C05251 TECHNICAL MANUAL
and
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