Rainbow-electronics DS1342 Bedienungsanleitung PDF herunterladen (Seite 4)

Low-Current I

C RTCs for High-ESR Crystals

DS1341/DS1342

Note 11: C

is the total capacitance of one bus line, including all connected devices, in pF.

Note 12: The parameter t

OSF

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

P V

CCMAX

Note 13: The DS1341/DS1342 can detect any single SCL clock held low longer than t

TIMEOUTMIN

. The devices’ I

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

C Serial Bus

SCL

NOTE: TIMING IS REFERENCED TO V

ILMAX

AND V

IHMIN

SDA

STOP START REPEATED

START

BUF

HD:STA

HD:DAT

SU:DAT

SU:STO

HD:STA

SU:STA

HIGH

LOW

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Rainbow-electronics DS1342 Bedienungsanleitung Seite 4