epc110

Symbol Parameter

Comments / Conditions

Values

Units

Min.

Typ.

Max.

Edge time CS to SCK

Falling edge CS to falling edge SCK

50

ns

Clock frequency of SCK

10

MHz

HIGH and LOW period of SCK

50

ns

Set-up and hold time of SI

Data stable before and after positive edge of SCK

15

ns

Output data of SO valid

Data valid after negative edge of SCK

20

ns

Rise / fall time SO / SCK

20

ns

Input Data Format and Command List

The communication is based on telegrams (Direct commands or results), which are sent and received over the SPI interface.

The input data format (telegram) is given in Figure 15. The first bit in the data stream from the microprocessor to the epc110 chip (SI pin) will

be B = 0 always.

Figure 15: Communication to the epc110 device: Direct Command

Command set:

Name

Cmd Code

Start

B

Cmd Code

Command

C0...C2

Cmd Code

Extension

R0...R4

Cmd Code

Data

D0...D16

Cmd Code

Termination

T0, T1

Function

Result Data

No. of data bits

on SPI interface

Command / Result

NOP

0

000

---

---

---

No operation,

or read out data

No

≧

4

READ

0

010

Register address

---

00

Read register Rn

Yes

11 / 22

WRITE

0

011

Register address

Data

00

Write data to RAM

(Register 16...18)

No

27 / --

PROG

0

110

Register address

---

---

Copy data to ROM

No

9 / --

RESET

0

111

11001

---

---

Reset the device

No

9 / --

Table 4: Command list

Remarks:

•

The telegram data is transmitted with the LSB first.

•

A telegram starts with the CS change from high to low (Synchronization) and ends with the change from low to high.

•

Single telegrams either commands as well results have to be separated by a CS = 1 in between.

•

Additional SCK clock cycles have no effect.

This allows to extend the above given minimal telegram lengths to a standardized telegram lengths (Byte, word or double-word).

•

The minimum telegram length is given in Table 3, section Number of data bits.

© 2011 ESPROS Photonics Corporation

Characteristics subject to change without notice

18

Datasheet epc110 - V2.1

www.espros.ch

<SPI Direct command>

<LST>

20.05.2011

Page 1

File:

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.

CS

SCK

SI

C0

C1

C2

R0

R1

R2

R3

R4

D0

D1

Dn

Command

Register Address or Cmd Extension

Data

B

T0

T1