ZSC31014EAC datasheet(36/58 Pages) IDT

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ZSC31014 Datasheet

January 20, 2016

3.4. I

2C™ Write Operations

For write operations, the I

2C™ master command starts with the 7-bit slave address with the 8th bit =0 (WRITE).

The ZSC31014 as the slave sends an acknowledge (ACK) indicating success. The ZSC31014 has two general

2C™ write command formats: I2C™ WRITE and I2C™ Write_MR. Figure 3.9 shows the structure of the write

packet for the two I

2C™ write commands, which are explained in sections 3.4.1 and 3.4.2.

Figure 3.9

2C™ Measurement Packet Writes

Device Slave

Address [6:0]

Wait for

Slave ACK

(2) I

2C Write_MR – Measurement Request:

Slave starts a bridge only measurement and DSP calculation cycle.

4 3 2 1 0 W

S 6 5

4 3 2 1 0 W

S 6 5

3 2 1 0 A 7

6 5 4

4 3 2 1 0

Device Slave

Address

(1) I

2C Write, Command Byte, and 2 Data Bytes.

Wait for

Slave ACK

Command

Byte

Data

Byte

4 3 2 1 0

Data

Byte

Acknowledge (ACK)

No Acknowledge

(NACK)

Read/Write Bit

(example: Write=0)

Start Condition

Device Slave Address

(example: Bit 5)

Wait for

Slave ACK

Wait for

Slave ACK

Wait for

Slave ACK

Data Bit

(example: Bit 2)

Stop Condition

Command Bit

(example: Bit 4)

3.4.1. I

2C™ Write_MR (Measurement Request)

Write_MR is a special I

2C™ write operation, which only includes the 7-bit slave address and the WRITE bit (0).

This command can only be sent in Sleep Mode (see section 3.1.2). It wakes up the part and starts a

measurement cycle for the bridge values only (no special measurement) and a DSP calculation based on former

AZ and Temperature values. After finishing the calculation with valid results written to the digital register, the

ZSC31014 powers down again and a Read_DF (see section 3.2.2) is required to read the valid values. See

Figure 3.9 for an illustration of Write_MR.

Note: The I

2C™ Write_MR function can also be accomplished using the I2C™ WRITE command with “don’t care”

data in Sleep Mode.

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