3.2. Commands & responses

The epc600 device works on a task principle: The chip is in a idle state and performs a single measurement or a read-out on command

only (refer to Figure 13).

The microprocessor sends a command to the chip. It is processed immediately. The tasks are: Execute a measurement or read data.

When the processing of the instruction is finished, then the chip sends back the answer to the controller by default. Refer to Figure 12 and

Figure 13.

The command format always has 8 bits, including 4 bits for command itself (C0-C3) and 4 bits to set the integration length (I0-I3). Bit 7

(MSB) is transmitted first, bit 0 (LSB) last.

The response format is always 16 bits. Bit 15 (MSB) is transmitted first, bit 0 (LSB) last.

3.2.1. Command: Commands & Integration times

Name:

Command & Integration time

Bit

7

6

5

4

3

2

1

0

C3

C2

C1

C0

I3

I2

I1

I0

Description

CMD [3:0]

INT [3:0]

CMD:

Command to start the measurement with a defined integration time or to read data.

Description

CMD

INT

epc600 response

Waiting time

Read Q-subsample QS0

0001

0000

Q-subsample QS0

Read Q-subsample QS1

0010

0000

Q-subsample QS1

Read Q-subsample QS2

0011

0000

Q-subsample QS2

Read Q-subsample QS3

0100

0000

Q-subsample QS3

Read temperature

0101

0000

Temperature

Read pixel status

0110

0100

Valid & saturated pixels

Measurement of distance

Note: Modulated light is emitted

1000

see INT

Distance

Measurement of ambient-light level

Note: No light is emitted

1101

see INT

Ambient-light level

Don't use

Others

INT:

Note: A doubling of the integration time is equal to a doubling of the illumination in the scenery.

The integration times below in the table are for a LED modulation frequency of 10MHz.

Time

INT

Time

INT

Time

INT

Time

INT

1.60 μs

0000

25.6 μs

0100

408 μs

1000

6.56 ms

1100

3.20 μs

0001

51.2 μs

0101

818 μs

1001

13.2 ms

1101

6.40 μs

0010

103 μs

0110

1.64 ms

1010

26.3 ms

1110

12.8 μs

0011

205 μs

0111

3.28 ms

1011

52.6 ms

1111

© 2014 ESPROS Photonics Corporation

Characteristics subject to change without notice

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Datasheet epc600 - V1.3

www.espros.ch