ch5001a ETC-unknow, ch5001a Datasheet - Page 9

• Manufacturer Part Number: ch5001a
• Description: Cmos Color Digital Video Camera
• Manufacturer: ETC-unknow

CHRONTEL
Power up control:
Seven bits within the CH5001 register map can have their default value determined at the time of power-up, or when
the Reset pin is exercised. This is accomplished by using a high valued pull-down resistor on the C[6:0] pins. At
power-up, the output buffers on these pins are tri-stated, and the pin is pulled high by an internal high impedance
pull-up device. This pull-up can be overridden by connecting a 100K ohm resistor externally to ground. After three
frames, the level at the C[6:0] pins is latched, and seven register bits are set or cleared depending upon the corre-
sponding pin's level. The C[6:0] pins functions are then returned to outputs of the chroma data. The power-up con-
trol affects the following register bits:
201-0000-032 Rev 3.0, 6/2/99
Table 2. Power Up Default Control
(PUD[3:0]*)
(PUD5*)
(PUD4*)
(PUD6)
C[3:0]
Pin
C5
C4
C6
Register
22h
19h
00h
1Eh
Bit
3:0
3
4
1
ADDO
The A/D Direct Output mode can be selected at power up. This may be
desirable for applications which want to use raw data. Logically inverted input
No pull-down resistor - Datapath processing
Pull-down resistor - A/D direct output
PD
The power down bit can be enabled at power up. This may be desirable in USB
cameras which have power limitations at power up. Logically inverted input
No pull-down resistor - Normal power-up
Pull-down resistor - Power-up in low-power mode
M0
The Mode[0] bit can be used to select between NTSC or PAL output at power
up.
No pull-down resistor - PAL operation
Pull-down resistor - NTSC operation
ASW[3:0]
The auto-shutter window can be selected at power up. See the register
description for corresponding window selection. Logically inverted inputs
No pull-down resistors gives window "0", Center location
Function
CH5001A
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