Page 8

ams Datasheet

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[v1-00] 2015-Mar-23

TMD2672 − Electrical Characteristics

Figure 8:

Proximity Characteristics, VDD = VLEDA = 3V, TA = 25°C, PEN = 1 (unless otherwise noted)

Note(s) and/or Footnote(s):

1. Value is factory-adjusted to meet the Prox count specification. Considerable variation (relative to the typical value) is possible after

adjustment.

2. Proximity offset varies with power supply characteristics and noise.

3. ILEDA is factory calibrated to achieve this specification. Offset and crosstalk directly sum with this value and is system dependent.

4. No glass or aperture above the module. Tested value is the average of 5 consecutive readings.

5. These parameters are ensured by design and characterization and are not 100% tested.

6. Proximity test was done using the following circuit. See “Application Information: Hardware” on page 31. section for recommended

application circuit.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

IDD

Supply current

LED On

3

mA

ILEDA

LEDA current (1)

LED On, PDRIVE = 0

100

mA

LED On, PDRIVE = 1

50

LED On, PDRIVE = 2

25

LED On, PDRIVE = 3

12.5

PTIME

ADC conversion steps

1

256

steps

PTIME

ADC conversion time

PTIME = 0xFF

(= 1 conversion step)

2.58

2.73

2.9

ms

PTIME

ADC counts per step

PTIME = 0xFF

(= 1 conversion step)

0

1023

counts

PPULSE

LED pulses (5)

0255

pulses

LED On

LED pulse width

PPULSE = 1, PDRIVE = 0

7.3

μs

LED pulse period

PPULSE = 2, PDRIVE = 0

16.0

μs

Proximity response, no

target (offset)

PPULSE = 8, PDRIVE = 0,

PGAIN = 4× (2)

100

counts

Prox count, 100mm target (3)

73mm × 83mm, 90%

reflective Kodak Gray Card,

PGAIN = 4×, PPULSE = 8,

PDRIVE = 0, PTIME = 0xFF (4)

450

520

590

counts