ZSC31014 datasheet(33/58 Pages) IDT

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ZSC31014 Datasheet

January 20, 2016

3.2. ZSC31014 Read Operations with I

2C™

For read operations, the I

2C™ master command starts with the 7bit slave address with the 8th bit =1 (READ). The

ZSC31014 as the slave sends an acknowledge (ACK) indicating success. The ZSC31014 has four I

2C™ read

commands: Read_MR, Read_DF2, Read_DF3, and Read_DF4. Figure 3.6 shows the structure of the

measurement packet for three of the four I

2C™ read commands, which are explained in sections 3.2.1 and 3.2.2.

Figure 3.6

2C™ Measurement Packet Reads

0 R

11 10 9

8 A 7

14 13 12

Device Slave

Address [6:0]

Device Slave

Address [6:0]

Wait for

Slave ACK

Start Condition

Stop Condition

Device Slave Address

(example: Bit 5)

Data Bit

(example: Bit 2)

(1) I

2C Read_MR – Measurement Request:

Slave starts a measurement and DSP calculation cycle.

Read/Write Bit

(example: Read=1)

Acknowledge (ACK)

(2) I

2C Read_DF2 – Data Fetch 2 Bytes:

Slave returns only bridge data to the master in 2 bytes.

Status Bit

0 R

Wait for

Slave ACK

No Acknowledge

(NACK)

Bridge Data

[13:8]

Master

ACK

Bridge Data

[7:0]

Master

NACK

0 R

11 10 9

8 A 7

14 13 12

Device Slave

Address [6:0]

Wait for

Slave ACK

Bridge Data

[13:8]

Master

ACK

Bridge

Data

[7:0]

0 R

11 10 9

8 A 7

14 13 12

Device Slave

Address [6:0]

(3) I

2C Read_DF3 – Data Fetch 3 Bytes:

Slave returns 2 bridge data bytes & temperature high byte (T[10:3]) to master.

Wait for

Slave ACK

Bridge Data

[13:8]

Master

ACK

Bridge Data

[7:0]

Master

ACK

Temperature

Data [10:3]

Master

ACK

Master

ACK

Temperature

Data [10:3]

Temperature

Data [2:0]

Master

NACK

N S

Master

NACK

N S

(4) I

2C Read_DF4 – Data Fetch 4 Bytes:

Slave returns 2 bridge data bytes & 2 temperature bytes (T[10:3]) and (T[2:0]xxxxx) to master.

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