s-24c02ci-t8t1u Seiko Instruments Inc., s-24c02ci-t8t1u Datasheet - Page 23

• Manufacturer Part Number: s-24c02ci-t8t1u
• Description: 2-wire Cmos Serial E2prom
• Manufacturer: Seiko Instruments Inc.

Rev.2.0
3. Phase adjustment during S-24C01C/02C access
[How to reset S-24C01C/02C]
The S-24C01C/02C does not have a pin to reset (the internal circuit). The users cannot forcibly reset it externally. If
the communication to the S-24C01C/02C interrupted, the users need to handle it as you do for software.
In the S-24C01C/02C, users are able to reset the internal circuit by inputting a start condition and a stop condition.
Although the reset signal is input to the master device, the S-24C01C/02C’s internal circuit does not go in reset, but it
does by inputting a stop condition to the S-24C01C/02C. The S-24C01C/02C keeps the same status thus cannot do
the next operation. Especially, this case corresponds to that only the master device is reset when the power supply
voltage drops.
If the power supply voltage restored in this status, input the instruction after resetting (adjusting the phase with the
master device) the S-24C01C/02C. How to reset is shown below.
SDA
SCL
The S-24C01C/02C is able to be reset by a start and stop instructions. When the S-24C01C/02C is reading data “0”
or is outputting the acknowledgment signal, outputs “0” to the SDA line. In this status, the master device cannot
output an instruction to the SDA line. In this case, terminate the acknowledgment output operation or the Read
operation, and then input a start instruction. Figure 28 shows this procedure.
First, input a start condition. Then transmit 9 clocks (dummy clock) of SCL. During this time, the master device sets
the SDA line to “H”. By this operation, the S-24C01C/02C interrupts the acknowledgment output operation or data
output, so input a start condition
sure, input the stop condition to the S-24C01C/02C. The normal operation is then possible.
*1. After 9 clocks (dummy clock), if the SCL clock continues to being output without inputting a start condition, S-
Remark Regarding this reset procedure with dummy clock, it is recommended to perform at the system
_00_C
24C01C/02C may go in the write operation when it receives a stop condition. To prevent this, input a start
condition after 9 clocks (dummy clock).
initialization after applying the power supply voltage.
Condition
Start
1
*1
Figure 28 Resetting S-24C01C/02C
. When a start condition is input, the S-24C01C/02C is reset. To make doubly
2
Dummy Clock
Seiko Instruments Inc.
8
9
2-WIRE CMOS SERIAL E
Condition
Start
Condition
S-24C01C/02C
Stop
2
PROM
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