EPC100_17 datasheet(21/29 Pages) EPC

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Manual epc10x

be optimized to the center of the receiving window. The resolution of TIMESTAMP is 4 bits. Thus, the value is 0000 if the

pulse is received at the beginning of the window, and 1111 if it arrived at the end. A light pulse received approx. in the middle

of the receive window would be represented as 0011, 0100 or 0101.

The minimal scan period TSCANmin, which is the time between two consecutive SCAN commands, is given by the

communication on the 2-wire bus: 62 bits for the command and the results have to be transmitted in this time. The minimal

scan period is then

SCANmin = 31⋅ TCLK ⋅k

k is given by the parameter DRATE and varies between 1 and 8 (refer to Table 1, Table 3 and Table 7). TCLK is 1μs. Thus, the

minimal scan period is 31μs for the 2Mbit/s transmission.

5.3 Special Cases

•

If the same device is addressed again at the end of its reception window, it continues waiting for pulses. This

procedure allows to synchronize the receiver with the transmitter on an optical basis, if there is no electrical

synchronization.

•

If a device detects a command during a scan operation which is not the command SCAN, it is put into standby mode.

•

A SCAN command with address 0 can be used to fetch the results without starting a new scan command.

Characteristics subject to change without notice

Page 21/29

Manual epc100 - V2.3-DRAFT 130812

EPC100 Datasheet(PDF) 21 Page - Espros Photonics corp