TMF8701 datasheet(15/66 Pages) OSRAM

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TMF8701 − Detailed Description

Reset Pin and Power-Up Timing

Figure 16:

Reset Pin and Power-Up Timing

Distance and Proximity Algorithm

As the performance of the algorithm is dependent on the ROM

version, following section only applies for devices with order

code TMF8701-1B (and TMF8701-1BM), calibrated and

in-application oscillator calibration using the reference driver

code and patched with the latest software patch from

ams OSRAM (contact ams OSRAM to identify latest patch

version).

The TMF8701 is embedded in the application using a 0.38mm

airgap and a glass with an IR ink with >90% transmissivity. The

glass thickness is 0.5mm. An additional mask on the opaque ink

is implemented according to TMF8701 optical design guide

(external document).

Calibration

To achieve the performance described in the next sections, a

calibration of the algorithm needs to be performed

(command = 0x0A). The TMF8701 shall be embedded in the final

application and the cover glass including the IR ink needs to be

assembled. The calibration test shall be done in a housing with

minimal ambient light and no target within 40cm in FOI of the

TMF8701.

The TMF8701 generates a calibration data set which is

permanently stored on the host.

On each power-up of the TMF8701 the calibration data set is

sent by I²C to the TMF8701 prior to execution of any algorithms

(commands=0x02 or 0x0B).

Operating Modes and Timings

The TMF8701 can be operated in two different modes:

• Proximity mode only; it uses 80k iterations at 43MHz for

capturing (VCSEL on).

Min

Typ

Max

Units

Comment

Power On (boot time)

Does not include RAM

download time

Enable High to Ready for

Measurement

8ms

Standby to Active Time

<<1

Active to Standby Time

<<1

Enable Low to Power Down Time

<<1

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