VCNL4020C

www.vishay.com

Vishay Semiconductors

Rev. 1.1, 20-Mar-18

7

Document Number: 84350

For technical questions, contact: sensorstechsupport@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

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Register #1 Product ID Revision Register

Register address = 81h. This register contains information about product ID and product revision.

Register data value of current revision = 21h.

Register #2 Rate of Biosensor Measurement

Register address = 82h.

Note

• If self_timed measurement is running, any new value written in this register will not be taken over until the mode is actualy cycled.

Register #3 LED Current Setting for Biosensor Mode

Register address = 83h. This register is to set the LED current value for biosensor measurement.

The value is adjustable in steps of 10 mA from 0 mA to 200 mA.

This register also contains information about the used device fuse program ID.

TABLE 2 - PRODUCT ID REVISION REGISTER #1

Bit 7Bit 6Bit 5Bit 4

Bit 3

Bit 2Bit 1Bit 0

Product ID

Revision ID

Description

Product ID

Read only bits. Value = 2

Revision ID

Read only bits. Value = 1

TABLE 3 - BIOSENSOR RATE REGISTER #2

Bit 7Bit 6Bit 5Bit 4

Bit 3

Bit 2Bit 1Bit 0

n/a

Rate of biosensor Measurement (no. of

measurements per second)

Description

Biosensor rate

R/W bits.

000 - 1.95 measurements/s (DEFAULT)

001 - 3.90625 measurements/s

010 - 7.8125 measurements/s

011 - 16.625 measurements/s

100 - 31.25 measurements/s

101 - 62.5 measurements/s

110 - 125 measurements/s

111 - 250 measurements/s

TABLE 4 - LED CURRENT REGISTER #3

Bit 7Bit 6Bit 5Bit 4

Bit 3

Bit 2Bit 1Bit 0

Fuse prog ID

LED current value

Description

Fuse prog ID

Read only bits.

Information about fuse program revision used for initial setup/calibration of the device.

LED current value

R/W bits. LED current = Value (dec.) x 10 mA.

Valid Range = 0 to 20d. e.g. 0 = 0 mA, 1 = 10 mA, …., 20 = 200 mA (2 = 20 mA = DEFAULT)

LED Current is limited to 200 mA for values higher as 20d.