ISL24212 Datasheet, PDF (10/12 Pages) Intersil Corporation – Programmable VCOM Calibrator with EEPROM and Output Buffer

ISL24212
Up/Down Counter Waveforms
The operation modes of the ISL24212 is shown in Table 2.
TABLE 2. ISL 24212 OPERATION MODES
INPUT
OUTPUT
CTL
CE
COUNTER V_{COM_OUT}
EEPROM
X
Lo
No Change
X
Lo to Hi Ignore first CTL pulse
No Change
Hi to Mid
Hi Decrement Increase
No Change
Lo to Mid
Hi
Increment Decrease
No Change
Mid to >4.9V Hi
No Change No Change Write Counter
Value to EEPROM
>4.9V to Mid Hi
Ignore next CTL Pulse
No Change
X
Hi to Lo EEPROM Programmed No Change
Read Value
Value
Figure 11 shows the associated waveforms.
NOTE:
AFTER COUNTER ENABLE IS ASSERTED,
THE FIRST CTL PULSE IS IGNORED
V_PROG = 4.9V
t_ST
CTL HIGH
CTL V_DD/2
CTL LOW
t_MTC
t_{H_MIN}
t_{L_MIN}
t_PROG
FIRST PULSE AFTER
PROGRAMMING IS
IGNORED
t_{H_REJ}
t_READ
t_{L_REJ}
FIRST PULSE AFTER
ASSERTING CE IS
IGNORED
CE
ENABLE ADJUSTMENT
t_{L_PROP}
DISABLE ADJUSTMENT
ENABLE ADJUSTMENT
t_{H_PROP}
AVDD
VDD
COUNTER
OUTPUT
78
ASSUME COUNTER
STARTS WITH VALUE 78
VCOM
79
7A
7B
WRITE 7B TO
EEPROM
7A
7B
7A
DEASSERTING CE
RELOADS 7B
FROM EEPROM
EXAMPLE POST POWER-UP TIMING
FIGURE 11. COUNTER INTERFACE TIMING DIAGRAM
10
FN7590.0
March 15, 2011