VCNL4010

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Vishay Semiconductors

Rev. 1.3, 23-Feb-12

6

Document Number: 83462

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

The VCNL4010 contains seventeen 8 bit registers for operation control, parameter setup and result buffering. All registers are

Fig. 13 - Send Byte/Receive Byte Protocol

Device Address

The VCNL4010 has a fix slave address for the host

programming and accessing selection. The predefined 7 bit

significant bit (LSB) defines read or write mode. Accordingly

the bus address is set to 0010 011x = 26h for write, 27h for

read.

Register Addresses

VCNL4010 has seventeen user accessible 8 bit registers.

The register addresses are 80h (register #0) to 90h

(register #16).

REGISTER FUNCTIONS

Register #0 Command Register

Register address = 80h

The register #0 is for starting ambient light or proximity measurements. This register contains 2 flag bits for data ready indication.

Note

• With setting bit 3 and bit 4 at the same write command, a simultaneously measurement of ambient light and proximity is done. Beside als_en

and/or prox_en first selftimed_en needs to be set. On-demand measurement modes are disabled if selftimed_en bit is set. For the

selftimed_en mode changes in reading rates (reg #4 and reg #2) can be made only when b0 (selftimed_en bit) = 0. For the als_od mode

changes to the reg #4 can be made only when b4 (als_od bit) = 0; this is to avoid synchronization problems and undefined states between

the clock domains. In effect this means that it is only reasonable to change rates while no selftimed conversion is ongoing.

S

Slave address

Rd

Receive byte

Read data from VCNL4010

A

Register address

A

Wr

P

S

Slave address

P

A

A

Data byte

Send byte

Write command to VCNL4010

S = start condition

P = stop condition

A = acknowledge

Host action

VCNL4010 response

S

Slave address

A

Register address

A

Wr

P

Data byte

A

22313-1

TABLE 1 - COMMAND REGISTER #0

Bit 7Bit 6

Bit 5Bit 4

Bit 3Bit 2Bit 1Bit 0

config_lock

als_data_rdy

prox_data_rdy

als_od

prox_od

als_en

prox_en

selftimed_en

Description

config_lock

Read only bit. Value = 1

als_data_rdy

Read only bit. Value = 1 when ambient light measurement data is available in the result registers. This bit

will be reset when one of the corresponding result registers (reg #5, reg #6) is read.

prox_data_rdy

Read only bit. Value = 1 when proximity measurement data is available in the result registers. This bit will

be reset when one of the corresponding result registers (reg #7, reg #8) is read.

als_od

R/W bit. Starts a single on-demand measurement for ambient light. If averaging is enabled, starts a

sequence of readings and stores the averaged result. Result is available at the end of conversion for

reading in the registers #5(HB) and #6(LB).

prox_od

R/W bit. Starts a single on-demand measurement for proximity.

Result is available at the end of conversion for reading in the registers #7(HB) and #8(LB).

als_en

R/W bit. Enables periodic als measurement

prox_en

R/W bit. Enables periodic proximity measurement

selftimed_en

R/W bit. Enables state machine and LP oscillator for self timed measurements; no measurement is

performed until the corresponding bit is set