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AT25DF161-SH Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT25DF161-SH Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 19 page Atmel AVR1923 11 8394B-AVR-02/12 V0: Display voltage (contrast control). ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + Ra Rb 1 : Voltage regulator internal resistance ratio. VREG: Internal fixed voltage supply typically 2.1V. α: Electronic volume level, 1 to 64 are possible values: The recommended configuration for the display is to use 5 . 3 1 = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + Ra Rb because it will center the adjustable voltage range at 6V which is the typical setting for this display. Recommended values for α are listed in Table 5-6. Table 5-6. Recommended electronic volume configuration. Electronic volume register value (α) Display supply voltage V0 [V] Contrast 20 6.44 Too strong contrast 21 6.40 22 6.35 23 6.31 24 6.26 25 6.22 26 6.17 27 6.13 28 6.08 29 6.03 30 5.99 Optimal setting 31 5.94 32 5.90 33 5.85 34 5.81 35 5.76 36 5.72 37 5.67 38 5.63 39 5.58 40 5.54 Very weak contrast The display backlight is controlled by a FET which is by default in an off state but it is possible to turn the backlight on with the Atmel AVR XMEGA by driving the gate of the FET high. On the XMEGA pin PE4 is connected to the gate of the FET. The pin PE4 is also an output of an on-chip timer module and because of that it is easy to do dimming of the backlight by using PWM. |
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