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Power Up/Down Time (ms) Options

Power Up/Down Time (ms) Options

It is possible to select the VCOM ramp up/down time from GND level to a common voltage level or vice-versa by choosing a VCOM capacitor value and time by choosing one of the available checkboxes. A 4.7μF VCOM capacitor is chosen as the default setting (this capacitor is also mounted on the EVM).

The 4.7μF VCOM capacitor is the recommended value for operating the EVM. This configuration is the recommended power-on sequence discussed in the product data sheet.

To select a different VCOM value, choose the appropriate value from the VCOM capacitor drop-down menu. Be sure to change the capacitor on the EVM to the same value (1.0μF, 2.2μF or 10μF).

The combination of PTM[1:0] and RES[4:0] determines the VCOM ramp up/down time, as described in Table 3-2and Table 3-3.

To set the ramp up or down time without directly accessing the registers, users can select a VCOM capacitor value and time in the group box. The ramp up waveform with the default setting is shown in Figure 3-5, and the ramp down waveform in Figure 3-6, as references.

Table 3-2. PCM3793A/94A Resistor 125(7dh)

RES[4:0]: Resistor Value Control

RES [4:0]

VCOM Resistor Value

10000

60 kΩ

11000

24 kΩ

11100

12 kΩ

11110

6 kΩ

Others

Reserved

Table 3-3. PCM3793A/94A Resistor 125(7dh) PMT[1:0]: Power Up/Down Time Control and

Register Direct Access

VCOM Capacitor

 

 

Power-Up Time

Power-Down Time

Register Direct

[μF]

RES[4:0]

PTM[1:0]

[ms]

[ms]

Access

10

11110

00

450

750

0x7D1E

 

11100

11

900

1500

0x7D7C

 

11000

Do not set

 

10000

Do not set

4.7

11110

01

250

400

0x7D3E

 

11100

00

450

750

0x7D1C (default)

 

11000

11

900

1500

0x7D78

 

10000

Do not set

2.2

11110

10

100

300

0x7D5E

 

11100

01

250

400

0x7D3C

 

11000

00

450

750

0x7D18

 

10000

11

900

1500

0x7D70

1.0

11110

Do not set

 

11100

10

100

300

0x7D5C

 

11000

01

250

400

0x7D38

 

10000

00

450

750

0x7D10

SBAU127 –July 2007

Set-Up Guide

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Texas Instruments DEM-DAI3793A Power Up/Down Time ms Options, PCM3793A/94A Resistor 1257dh RES40 Resistor Value Control

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