ISL24201_14 Datasheet, PDF (9/12 Pages) Intersil Corporation – Programmable VCOM Calibrator with EEPROM

ISL24201
2.7mA
200µA
50µA
90µA
IP
~1ms
25µA
100ms
Max
FIGURE 11. I_DD AND I_AVDD CURRENT PROFILE DURING EEPROM
PROGRAMMING
Start EEPR O M
P rogram m ing
E rase P ulse
Are EEPRO M
No
C ells E rased?
Yes
W rite P ulse
A re
No
E E P R O M C ells
Program m ed?
Yes
EEPROM
P rogram m ing
C om plete
FIGURE 12. EEPROM PROGRAMMING FLOWCHART
ISL24201 Programming
The ISL24201 accepts I²C bus address and data when the WP
pin is at or above V_IH (>0.7V_DD). The ISL24201 ignores the I²C
bus when the WP pin is at or below V_IL (<0.3V_DD). Figure 13
shows the serial data format for writing the register and
programming the EEPROM. Figure 14 shows the serial data
format for reading the DAC register. Table 2 shows the truth table
for reading and writing the device.
TABLE 2. ISL24201 READ AND WRITE CONTROL
WP PIN
I²C BITS
FUNCTION
R/W
PROGRAM
0
1
X
Read Register.
0
0
1
Will acknowledge I²C
transactions. Will not write to
register
0
0
0
Will acknowledge I²C
transactions. Will not write to
EEPROM.
1
1
X
Read DAC Register
1
0
1
Write DAC Register
1
0
0
Program EEPROM
Programming the EEPROM memory transfers the current DAC
register value to the EEPROM and occurs when the control bits
select the programming mode and the A_VDD voltage is >10.8V.
After the EEPROM programming cycle is started, the WP pin can
be returned to logic low while the while it completes, which takes
a maximum of 100ms.
The ISL24201 uses a 6 bit I²C address, which is “100111xx”. The
complete read and write protocol is shown in Figures 13 and 14.
I²C Bus Signals
The ISL24201 uses fixed voltages for its I²C thresholds, rather
than the percentage of V_DD described in the I²C specification
(see Table 3). This should not cause a problem in most systems,
but the I²C logic levels in a specific design should be checked to
ensure they are compatible with the ISL24201.
TABLE 3. ISL24201 I²C BUS LOGIC LEVELS
SYMBOL
ISL24201
I²C STANDARD
I²CV_IL
I²CV_IH
0.55V
1.44V
0.3*V_DD
0.7*V_DD
9
FN7586.1
December 9, 2010