ZSSC3123AI2 datasheet(45/63 Pages) IDT

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ZSSC3123 Datasheet

January 26, 2016

EEPROM

The EEPROM array contains the calibration coefficients for gain and offset, etc., and the configuration bits for the analog front

end, output modes, measurement modes, etc. The ZSSC3123 EEPROM is arranged as 32 16-bit words (see Table 5.1). The

EEPROM is divided into two sections. Words 0H to 15H can only be written to if the EEPROM is unlocked. After the EEPROM

is locked these locations can no longer be written to. The EEPROM lock bits are in the ZMDI_Config register (see Table 5.2

for the bit assignment). Words 16H to 1FH (highlighted blue in Table 5.1) are always unlocked and available to write to at all

times. See section 4 for instructions on reading and writing to the EEPROM in Command Mode via the I

2C™ interface. When

programming the EEPROM, an internal charge pump voltage is used; therefore a high voltage supply is not needed.

Note: If the EEPROM was accidentally locked, it can be unlocked with the following instructions (see section 4 for how to send

commands).

Enter Command Mode with a Start_CM command.

Send an A2H for the command byte and 0000H for the command data.

Send an F0H for the command byte and 0021H for the command data.

Clear the EEPROM_Lock bits in the ZMDI_Config register with an EEPROM Write command.

Reset the part.

There are four Customer_ID words available for customer use, two in the locked region and two in the unlocked region. They

can be used as a customer serial number for module traceability. (see Table 5.1 for Customer_ID EEPROM addresses.) The

integrity of the contents of the EEPROM array is ensured via ECC (see section 3.4.1).

Table 5.1 provides a summary of the EEPROM contents. The configuration register bits are explained in detail in the following

subsections.

Table 5.1

EEPROM Word Assignments

EEPROM

Word

Bit

Range

IC Default

Name

Description and Notes

00H

15:0

XXXXH

Cust_ID0

Customer ID byte 0: For use by customer (default value

is the upper 16 bits of the lot number)

01H

15:0

XXXXH

(LLLLLLLLB

0000ssssB)

Cust_ID1

Customer ID byte 1: For use by customer (default value

is the lower 8 bits of the lot number and an 8 bit wafer

number)

02H

15:0

0B00H

ZMDI_Config

IDT Configuration Register (See section 5.1.1)

03H

15:0

0006H

Not Available

Do Not Change; must leave at factory settings

04H

15:0

00FTH

Not Available

Do Not Change; must leave at factory settings

***

05H

15:0

0000H

Not Available

Do Not Change; must leave at factory settings

06H

15:0

0C06H

C_Config

AFE Capacitance Configuration Register:

See Table 5.3.

07H

15:0

0000H

SOT_tco

nd order temperature offset correction for capacitance

08H

15:0

0000H

Tco

Temperature offset correction for capacitance

09HH

15:0

0000H

SOT_tcg

nd order temperature gain correction for capacitance

0AH

15:0

0000H

Tcg

Temperature gain correction for capacitance

*** The T in the default setting for EEPROM word 04

H represents the custom trim value determined by final test. Do not change this setting.

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