Datasheet

Page 50 ams Datasheet
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TMF8701 − Application Information
Schematic
The TMF8701 needs only 3 small 0402 external capacitors for
operation:
Figure 116:
TMF8701 Application Schematic
The SYNC signal connected to GPIO1 can be used to
immediately interrupt the TMF8701 VCSEL operation if the high
power illuminator is operating. It needs to be ensured that SYNC
does not exceed the VDD supply of TMF8701 as otherwise an
internal protection diode will start conducting. The VCSEL
operation is controlled by setting cmd_data5 of
command=0x02 or 0x03 according (see App0 Registers –
appid=0xC0 registers). On SYNC assertion, the VCSEL is
immediately switched off (typically after 10μs), on SYNC
de-assertion the VCSEL operation is resumed within >100μs.
GPIO0 can be used as a general GPIO output signal.
The signals INT/SDA/SCL need an external pullup resistor to the
V
IO
supply (typically 1.8V).
TMF87 01
VCSEL
Optical
Filter
Reflective
Surface
Background
Light
Internal
Reflection
Optics
SPAD,
TDC and
Histogram
Driver
Control
Data
Process
EN
GPIO1
GPIO0
INT
SDA
SCL
VDDCGNDC
VDDV
GNDV
VDD
GND
Host
VDD
0.1µF/6V3
VDD
2x
0.1µF/6V3
High
Power
Illuminator
V IO
SYNC