S-24C16C Seiko Instruments Inc., S-24C16C Datasheet - Page 24

• Manufacturer Part Number: S-24C16C
• Description: 2-wire Serial E2prom
• Manufacturer: Seiko Instruments Inc.

24
2-WIRE SERIAL E
S-24C16C
3. Phase adjustment during
[How to reset S-24C16C]
The S-24C16C does not have a pin to reset (the internal circuit). The users cannot forcibly reset it externally. If the
communication to the S-24C16C interrupted, the users need to handle it as you do for software.
In the S-24C16C, 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-24C16C’s internal circuit does not go in reset, but it does
by inputting a stop condition to the S-24C16C. The S-24C16C 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-24C16C. How to reset is shown below.
SDA
SCL
The S-24C16C is able to be reset by a start and stop instructions. When the S-24C16C 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 26 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-24C16C interrupts the acknowledgment output operation or data
output, so input a start condition
input the stop condition to the S-24C16C. 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
24C16C may go in the write operation when it receives a stop condition. To prevent this, input a start condition
after 9 clocks (dummy clock).
Regarding this reset procedure with dummy clock, it is recommended to perform at the system
initialization after applying the power supply voltage.
Condition
Start
2
PROM
S-24C16C
1
*1
. When a start condition is input, the S-24C16C is reset. To make doubly sure,
Figure 26 Resetting S-24C16C
access
2
Dummy Clock
Seiko Instruments Inc.
8
9
Condition
Start
Condition
Stop
Rev.2.1
_00_H