TMF8701 datasheet(28/66 Pages) OSRAM

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Datasheet, Public

Page 27

[v2-00] 2023-Feb-21

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TMF8701 − Register Description

Note(s):

1. At the end of the transaction of read a quarter, the contents of the registers from 0x20-0x9F will be automatically updated, and the

contents of registers REGISTER_CONTENTS and TID will be updated.

2. At the end of a TDC, the TDC number will also auto increment.

0x30

Enable histogram readout; the internal state machine will

stop when a histogram (e.g. calibration) is available and

wait for readout by the host. If the selected histogram is

readout, the host shall continue the state machine by

sending command 0x32

cmd_data3 = Bitmask for the histograms to be readout:

• Always set bit 0 to ‘0’

• Set bit 1 to get electrical calibration histograms

• Set bit 2 to get optical calibration histogram

• Always set bit 3 to ‘0’

• Set bit 4 to get proximity histograms

• Always set bit 5 and 6 to ‘0’

• Set bit 7 to get distance measurement histograms

cmd_data2 = Set to 0x00

cmd_data1 = bitmask for pileup correct histograms

readout:

• Set bit 0 to get pileup corrected distance

measurement histograms

• Set bit 1 to get pileup corrected sum histogram

• Set bit 2 to get pileup corrected proximity histogram

• Always set bit 3-7 to 0

cmd_data0 = Set to 0x00

Once above bitmask is set, the device is programed to

stop when the histogram is available. Set command=0x04

to actually perform the measurement.

0x32

After the host has readout the histogram, continue with

internal processing.

0x47

Read out serial number – results see section Serial

Number Readout – If Register register_contents=0x47

0x80 …

0x93

Read 1 quarter of one histogram - copy histogram

bits[4:2] to select

TDC0… TDC5, quarter bits[1:0] into 0x20... 0x9f (1), (2)

0xff

Stop whatever you are doing as soon as possible and

reenter the idle state. The current state will not be

interrupted and will require leaving the current state

processing to take effect. This command will stop

continuous measurement.

0x10: COMMAND

Field

Name

Reset

Type

Description

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