9. Electrical Characteristics
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ETM50E-07 Seiko Epson Corporation 13
9.2. AC characteristics
Table 7 AC characteristics
Unless otherwise specified GND = 0 V V
IO
= 1.6 V ~5.5 V Ta = -40C ~ +85C
Standard-Mode
(fSCL=100 kHz)
Start condition setup time
Start condition hold time
Stop condition setup time
Bus idle time between
start condition and stop condition
Rise time for SCL and SDA
Fall time for SCL and SDA
Allowable spike time on bus
Figure 9 I
2
C-Bus Interface Timing Chart
Warning: When accessing this device, all communication from transmitting the start condition to transmitting the
stop condition after access should be completed within 0.95 seconds.
If such communication requires 0.95 seconds or longer, the I
2
C-Bus interface is reset by the internal bus
timeout function.
When bus-time-out occur, SDA turns to Hi-Z input mode.
Note: During access to the time registers, the time counting is on hold. This means that up to 1 second can be “lost”
in case of unsuccessful communication as mentioned above.
Please make sure to send I
2
C start condition before actual transmission of the RTCs slave address as
otherwise the slave address appears to be shifted by 1 bit.
Table 8 AC characteristics (FOUT)
※Unless otherwise specified GND = 0 V , VIO = 1.6 V 5.5 V , Ta= 40 C +85 C
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