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Page 15

Operation

TM-250 Miniature CCD Camera

The following four asynchronous shutter modes are available:

• Strobe Asynchronous Shutter Mode

• Pre-Reset Asynchronous Shutter Mode

• Post-Reset Asynchronous Shutter Mode

• Pulse Width Asynchronous Shutter Mode

Please contact PULNiX for timing charts of various asynchronous shutter modes.

3.3.4 External Sync Mode

TM-250 accepts standard RS-170 external sync, which is deﬁned as horizontal sync (HD) and vertical

sync (VD). The phase-locked loop jitter is designed to be the minimum (< 5ns) in this category using

the latest PLL chip. The wide capture range enables the camera to operate at an extended temperature

range (optional) of -35°C to 65°C. HD and VD input is TTL level and the high impedance is 100KΩ or

75Ω (optional).

3.3.5 Reset-Restart Mode

Rather than using VINIT as asynchronous reset, the camera can be reset using EXT VD. In this mode,

the camera needs multiple VD pulses to output valid images, depending on whether it is set to Field or

Frame mode. Usually, the ﬁrst ﬁeld (Field mode) or the ﬁrst frame (Frame mode) are garbage because

of previous signal residuals prior to reset. A frame grabber has to know which frame or ﬁeld to capture.

External HD must be applied for this operation.

3.3.6 External Shutter Control

The shutter speed or exposure can be controlled with external pulse (TRIG) in this mode. In

combination with Reset-Restart Pulse (EXT VD), the camera can be externally controlled for image-

capture timing as well as for exposure time.

This is an excellent application for capturing multiple images (two ﬁelds of images) of indexing objects

under various lighting or brightness conditions. When Frame mode is selected, the full vertical

resolution is achieved by taking two ﬁelds of shutter images, whether or not you are using an electronic

shutter.

3.3.7 Integration

When integration control (VINIT) is low, the CCD imager keeps integrating. When the signal returns to

high, it enables the charge transfer for video output. This mode integrates longer than one ﬁeld. With

strobe light application, it can capture randomly strobed images during the integration. It also increases

the exposure time to enhance low-light viewing.

3.3.8 Non-Interlace Operation

With non-interlace external sync, the camera operates at non-interlace scanning. External VD must be

generated at integer of 262H ± 8H. (Standard interlace is 262.5 H)

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