2.2. General Hardware Configuration

The general hardware configuration section covers all design aspects for an epc600 circuit.

2.3. Power Supply, Clock generation

The external voltage supplies are +8.5V DC as a main supply and -5.0V DC as a bias voltage. Both supplies need to be stable, well regu -

lated and with a low level of noise and ripple voltage (because the epc600 chip is a sensitive, highly amplifying device).

eration in order to choose the right components for the design.

All necessary power supply decouplings and the supply of the external reference clock have to be designed according to Figure 20 and

Table 7. Capacitors C3 – C9 are used for decoupling of the internally generated voltages.

The Schottky diode D1 is vital to ensure a correct power-up of the device.

C3

LED

NC3

NC4

VREF

VDDIO

VDDHPX

VDDPX

VDDCP

VDDBS

XTAL1

XTAL2

GNDM

VDDT

SDATA

SCLK

HLLED/NC2

NC1

VDDPLL

VDDCORE

GNDLED

GNDPLL

GNDA

GND

VDD

epc600

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

C6

C8

C4

C5

C7

C9

+

C2

C1

VDD +8.5V

GND

D1

C10

C11

Y1

VDDBS -5.0V

R1

R2

+5V

R3

Figure 20: Main power supply decoupling and clock supply

Part No. Pin

Pin No.

Component value

Min.

Nom.

Max.

Type

C1

VDD

10

10μF

+8.5V

C2

VDD

10

1μF

+8.5V

Ceramic X7R

C3

VDDCORE

2

1μF

1μF

3.3μF

+1.8V

Ceramic X7R

C4

VDDPLL

17

1μF

1μF

3.3μF

+1.8V

Ceramic X7R

C5

VDDIO

7

3.3μF

3.3μF

10μF

+5.0V

Ceramic X7R

C6

VDDPX

8

3.3μF

3.3μF

10μF

+5.0V

Ceramic X7R

C7

VDDPXH

9

3.3μF

3.3μF

6.8μF

+10V

Ceramic X7R

C8

VDDCP

11

10nF

100nF

100nF

+12V

Ceramic X7R

C9

VDDBS

6

10nF

10nF

20nF

-5.0V

Ceramic X7R

C10

XTAL1

15

27pF

+1.8V

Ceramic NP0

C11

XTAL2

16

27pF

+1.8V

Ceramic NP0

Y1

XTAL1 & XTAL2

15 & 16

4 MHz

Crystal-oscillator

D1

VDD & VDDCP

10 & 11

Schottky diode

R1

HLLED

1

1kOhm

+5.0V

Resistor

R2

NC4

14

zero Ohm

+5.0V

Resistor

R3

SDATA

19

see chapter 2-wire serial interface

+5.0V

Resistor

Leave open the pins NC1, NC3 and VREF. They do not require any termination.

Table 7: Component values

© 2014 ESPROS Photonics Corporation

Characteristics subject to change without notice

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Datasheet epc600 - V1.3

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