Rainbow Electronics DS1342 - Manual (Page 4)

Low-Current I 2 C RTCs for High-ESR Crystals
DS1341/DS1342
4
Note 11: CB is the total capacitance of one bus line, including all connected devices, in pF.
Note 12: The parameter tOSF is the period of time the oscillator must be stopped for the OSF flag to be set over the voltage
range of 2.4V P V CC P V CCMAX .
Note 13: The DS1341/DS1342 can detect any single SCL clock held low longer than t TIMEOUTMIN . The devices’ I 2 C interface is
in reset state and can receive a new START condition when SCL is held low for at least t TIMEOUTMAX . Once the device
detects this condition, the SDA output is released. The oscillator must be running for this function to work.
Figure 1. Data Transfer on I 2 C Serial Bus
SCL
NOTE: TIMING IS REFERENCED TO V ILMAX AND V IHMIN .
SDA
STOP START REPEATED
START
t BUF
t HD:STA
t HD:DAT t SU:DAT
t SU:STO
t HD:STA
t SP
t SU:STA
t HIGH
t R
t F
t LOW