isl24212 Intersil Corporation, isl24212 Datasheet - Page 10

• Manufacturer Part Number: isl24212
• Description: Programmable Vcom Calibrator With Eeprom And Output Buffer
• Manufacturer: Intersil Corporation

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