MLX90808 Datasheet, PDF (7/8 Pages) Melexis Microelectronic Systems – Absolute Integrated Pressure Sensor

MLX90808
Absolute Integrated Pressure Sensor
9.2 Zapping of the 90808
The permanent memory of the 90808 is built with zap cells.
The data output of an unprogrammed zap cell is 0. The data output is 1 when the cell is zapped.
It is not possible to reprogram a zap cell to 0. Only 1 bit can be zapped at a time.
You should use the normal mode (TC[5:0]=00h) and program 1 bit to '1' in the temporary memory.
Afterwards you need to increase the supply voltage (VCC_Z) to be able to zap the bit. The zapping starts
when OUT goes high (OUT_Z). There will flow a high current of approximately 200mA during the zapping.
The memlock-bit should be zapped as last bit, because it disables the programming.
The zap cells can also be read out by using mode 5 (TC[5:0]=05h).
One bit should be set to 1 in the temporary memory.
The supply current should be measured at the normal supply voltage.
A low current (ICC_R0) indicates that the zap cell is not programmed.
A high current (ICC_R1) indicates that the zap cell is programmed.
3901090808
Rev 001
Page 7 of 8
Data Sheet
Feb 08