TMD2772 datasheet(9/59 Pages) AMSCO

Part #	TMD2772

Description	Digital ALS and Proximity Module

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Manufacturer	AMSCO [ams AG]

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9 / 59 page

ams Datasheet, Confidential

Page 9

[v1-20] 2014-Jul-21

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TMD2772/ TMD2772WA − Electrical Characteristics

Figure 11:

Proximity Characteristics, VDD = LEDA = 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. These parameters are ensured by design and characterization and are not 100% tested.

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

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

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

6. Proximity test was done using the circuit shown in Figure 12. See Section , “PCB Pad Layout,” on page 46 for recommended

application circuit.

Parameter

Test Conditions

Min

Typ

Max

Units

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 (2)

0

255

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×, (3)

100

counts

Prox count, 100mm target,

TMD2772 devices (4)

73 mm × 83 mm, 90% reflective

Kodak Gray Card, PGAIN = 4×,

PPULSE = 8, PDRIVE = 0,

PTIME = 0xFF (5)

450

520

590

counts

Prox count, 100mm target,

TMD2772WA devices (4)

73 mm × 83 mm, 90% reflective

Kodak Gray Card, PGAIN = 4×,

PPULSE = 8, PDRIVE = 0,

PTIME = 0xFF (5)

235

275

315

counts

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