s-24cs64a Seiko Instruments Inc., s-24cs64a Datasheet - Page 22

• Manufacturer Part Number: s-24cs64a
• Description: 2-wire Cmos Serial E2prom
• Manufacturer: Seiko Instruments Inc.

22
2-WIRE CMOS SERIAL E
S-24CS64A
4. Acknowledge check
5. Built-in power-on-clear circuit
5.1 Raising power supply voltage
The I
communication error. This function allows detection of a communication failure during data communication
between the microprocessor and E
recommended to perform an acknowledge check on the microprocessor side.
E
may cause a malfunction. For the power-on-clear circuit to operate normally, the following conditions must
be satisfied for raising the power supply voltage.
Raise the power supply voltage, starting at 0.2 V maximum, so that the voltage reaches the power supply
voltage to be used within the time defined by t
For example, when the power supply voltage to be used is 5.0 V, t
The power supply voltage must be raised within 200 ms.
2
PROMs have a built-in power-on-clear circuit that initializes the E
2
C-bus protocol includes an acknowledge check function as a handshake function to prevent a
V
*1. 0 V means there is no difference in potential between the VCC pin and
*2. t
INIT
the GND pin of the E
accepted during this time.
(Max.)
INIT
is the time required to initialize the E
2
PROM
0.2 V
Figure 26 Raising Power Supply Voltage
2
2
PROM. This function is effective to prevent malfunction, so it is
PROM.
Seiko Instruments Inc.
t
t
RISE
RISE
INIT
*2
as shown in Figure 26 .
(Max.)
(Max.)
2
PROM. No instructions are
RISE
Power supply voltage (V
0 V
2
PROM. Unsuccessful initialization
*1
is 200 ms as shown in Figure 27 .
CC
Rev.4.1
)
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