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PNI Sensor Corporation Doc #1018049 R03

SENtral Technical Data Sheet Page 14

Data transfer is always initiated by the host. Data is transferred between the host and

SENtral serially through the data line (SDAS) in an 8-bit transfer format. The transfer is

synchronized by the serial clock line, SCLS. Supported transfer formats are single-byte read,

multiple-byte read, single-byte write, and multiple-byte write. The data line can be driven

either by the host or SENtral. Normally the serial clock line will be driven by the host,

although exceptions can exist when clock-stretching is implemented in Pass-Through State.

4.2.1 I

C Slave Transfer formats

Figure 4-2 illustrates writing data to registers in single-byte or multiple-byte mode.

START

SLAVE ADDRESS

ACK

DATA TO REGISTER (N)

ACK

DATA TO REGISTER (N+1)

ACK

STOP

From Host to SENtral

------------ Data Transferred (n bytes + acknowledge) ------------

From SENtral to Host

Figure 4-2: I

C Slave Write Example

The I

C host interface supports both a read sequence using repeated START conditions,

shown in Figure 4-3, and a sequence in which the register address is sent in a separate

sequence than the data, shown in Figure 4-4 and Figure 4-5.

START

SLAVE ADDRESS

ACK

START

SLAVE ADDRESS

ACK

DATA FROM REGISTER (N)

NACK

STOP

Data Transferred

(n bytes + acknowledge)

Figure 4-3: I

C Slave Read Example, with Repeated START

START

SLAVE ADDRESS

ACK

STOP

Figure 4-4: I

C Slave Write Register Address Only

START

SLAVE ADDRESS

ACK

DATA FROM REG. (N)

ACK

DATA FROM REG. (N+1)

NACK

STOP

From Host to SENtral

-------------- Data Transferred (n bytes + acknowledge) --------------

From SENtral to Host

Figure 4-5: I

C Slave read register from current address

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 53 54

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