ZMOD4450 Datasheet

© 2019 Integrated Device Technology, Inc.

12

October 30, 2019

11. Test and Calibration

As a unique feature, all sampled gas sensor modules are fully tested during IDT’s final test. The final test parameters in Table 8 are applied for

each ZMOD4450. All sensor modules are additionally pre-stabilized in the final test; although the user might see a small change in the module’s

raw signal during an initial warm-up phase during the first operation. The gas sensor module qualification is based on JEDEC (JESD47) and its

subsequent standard (JESD22, JESD78, etc.).

Table 8.

Final Test Parameters

Test

Test Object

Parameters

Test Results Saved in NVM?

Electrical

ASIC

Voltages, current consumption, frequencies, scan pattern

No

Electrical

Module

Calibration conditions, tracking ID, resistances

Yes

Gas

Module

Sensitivity parameters (slope and intercept) at stimulation with different gas

concentrations

Yes

Gas

Module

Pre-stabilization

No

12. I2C Interface and Data Transmission Protocol

The I2C slave device interface supports various bus speeds: Standard Mode (≤100kHz) and Fast Mode (≤ 400kHz).

one used for conventional EEPROM devices. The register to read/write is selected by a register address pointer. This address pointer must be

set during an I2C WRITE operation. After transmission of a register, the address pointer is automatically incremented. An increment from the

Table 9 gives the I2C bus characteristics.

confirm new values. After this register test, reset the device by disconnecting the power support; otherwise the device might not operate properly.

Figure 5. I2C Data Transmission Protocol

Write

Read

Write

From master to slave

From slave to master

S

START condition

P

STOP condition

A

N

Acknowledge

Not acknowledge

WRITE Access RAM

READ Access NVM and RAM

0

S

Slave Addr

7 Bit

1

A

Address

8 Bit

N P

Data

8 Bit

A S

Slave Addr

7 Bit

A

A

Data

8 Bit

A

Data

8 Bit

...

0

S

Slave Addr

7 Bit

A

Address

P

Data

8 Bit

A

A

Data

8 Bit

A

Data

8 Bit

...

A