ZSSC3123 Datasheet, PDF (45/63 Pages) List of Unclassifed Manufacturers – Capacitive Sensor Signal Conditioner

ZSSC3123 Datasheet
5 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 I²C™ 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).
1. Enter Command Mode with a Start_CM command.
2. Send an A2H for the command byte and 0000H for the command data.
3. Send an F0H for the command byte and 0021H for the command data.
4. Clear the EEPROM_Lock bits in the ZMDI_Config register with an EEPROM Write command.
5. 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
00H
15:0
XXXXH
Cust_ID0
XXXXH
01H
15:0
(LLLLLLLLB
Cust_ID1
0000ssssB)
02H
15:0
0B00H
ZMDI_Config
03H
15:0
0006H
Not Available
04H
15:0
00FTH
Not Available
05H
15:0
0000H
Not Available
06H
15:0
0C06H
C_Config
07H
08H
09HH
0AH
15:0
15:0
15:0
15:0
0000H
0000H
0000H
0000H
SOT_tco
Tco
SOT_tcg
Tcg
Description and Notes
Customer ID byte 0: For use by customer (default value
is the upper 16 bits of the lot number)
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)
IDT Configuration Register (See section 5.1.1)
Do Not Change; must leave at factory settings
Do Not Change; must leave at factory settings^***
Do Not Change; must leave at factory settings
AFE Capacitance Configuration Register:
See Table 5.3.
2^nd order temperature offset correction for capacitance
Temperature offset correction for capacitance
2^nd order temperature gain correction for capacitance
Temperature gain correction for capacitance
*** _{The T in the default setting for EEPROM word 04H represents the custom trim value determined by final test. Do not change this setting.}
© 2016 Integrated Device Technology, Inc.
45
January 26, 2016