EPC600 Datasheet, PDF (23/30 Pages) Espros Photonics corp – Time-of-flight range-finder chip

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:
INT:
Command to start the measurement with a defined integration time or to read data.
Description
Read Q-subsample QS0
Read Q-subsample QS1
Read Q-subsample QS2
Read Q-subsample QS3
Read temperature
Read pixel status
Measurement of distance
Note: Modulated light is emitted
Measurement of ambient-light level
Note: No light is emitted
Don't use
CMD
0001
0010
0011
0100
0101
0110
1000
1101
Others
INT
0000
0000
0000
0000
0000
0100
see INT
see INT
epc600 response
Q-subsample QS0
Q-subsample QS1
Q-subsample QS2
Q-subsample QS3
Temperature
Valid & saturated pixels
Distance
Waiting time
tACC = 3μs
tACC = 3μs
tACC = 3μs
tACC = 3μs
tACC = 3μs
tACC = 3μs
tMEAS
Ambient-light level
tMEAS
Sets the integration time for the measurement. T he measurement time is tMEAS = 4x integration time + 770μs.
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
1.60 μs
3.20 μs
6.40 μs
12.8 μs
INT
0000
0001
0010
0011
Time
25.6 μs
51.2 μs
103 μs
205 μs
INT
0100
0101
0110
0111
Time
408 μs
818 μs
1.64 ms
3.28 ms
INT
1000
1001
1010
1011
Time
6.56 ms
13.2 ms
26.3 ms
52.6 ms
INT
1100
1101
1110
1111
© 2014 ESPROS Photonics Corporation
Characteristics subject to change without notice
23 / 30
Datasheet epc600 - V1.3
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