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LM98722CCMT/NOPB Datasheet(PDF) 39 Page - Texas Instruments |
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LM98722CCMT/NOPB Datasheet(HTML) 39 Page - Texas Instruments |
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39 / 150 page  LM98722 www.ti.com SNAS487B – SEPTEMBER 2009 – REVISED MARCH 2015 7.4.12.3 Calibration Initiation Once these settings have been made, the Register Lock Control bit (Page 0, Register 0, Bit 0) should be set to begin converting pixels. Once the sensor data from the test image is stable the calibration process can be started by either setting the CAL register bit at Page 0, Register 0x01h, Bit 5, or by applying a logic high to the CAL input pin. (Both of these inputs are active when the Register Lock Control is set.) The CAL input pin is particularly useful for implementing page gap calibration. 7.4.12.4 Key Calibration Settings Table 8. Key Calibration Settings General Settings Calibration Mode Page 2, Register 0, Bits[1:0] Black Calibration Only 00 Black and White Full Calibration 01 Black and White Fine Tuning: 10 Number of Lines Page 2, Register 1 Black Loop Specific Settings # Black Pixels Averaged Page 2, Register 2, Bits[1:0] Black Target Page 2, Register 3 Black Pixels Start Page 2, Register 8 ADAC Scaling Page 2, Register 2, Bits[3:2] DDAC Scaling Page 2, Register 2, Bits[5:4] DDAC enable/disable Page 2, Register 0, Bit 2 White Loop Specific Settings White Target Page 2, Register 5 White Loop Tolerance Page 2, Register 4, Bits[6:3] White Pixel Averaging Window Size Page 2, Register 4, Bits[2:0] Active/White Pixels Start Page 2, Registers 0x09h, 0x0Ah Active/White Pixels End Page 2, Registers 0x0Bh, 0x0Ch The calibration loops are intended to be used prior to scanning the page or between pages being scanned. The black loop calibrates the channel offset such that the ADC outputs the desired code for Optical Black Pixels. The white loop calibrates the channel gain such that the ADC outputs the desired maximum white value when scanning a white target image. The Black Loop and White loop will both update until the # Lines setting is met. Settings of 1 to 254 lines will cause the loops to run for that many lines, and then stop. A setting of 255 will cause the calibration loops to run indefinitely. While using the Auto Black Level Correction Loop, the DAC registers are re-written as required every line the loop is running. While using the Auto White Level Correction Loop, the PGA registers are re-written as required every line the loop is running. Copyright © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 39 Product Folder Links: LM98722 |
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