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doc: update vcc schematic (#65)
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@@ -52,13 +52,13 @@ before calling **I2C_eeprom.begin()**.
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```cpp
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+---U---+
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A0 | 1 8 | VCC = +5V
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A0 | 1 8 | VCC = 1.7V to 5.5V
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A1 | 2 7 | WP = write protect pin
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A2 | 3 6 | SCL = I2C clock
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GND | 4 5 | SDA = I2C data
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+-------+
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default address = 0x50 .. 0x57 depending on three address lines
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Default address = 0x50 .. 0x57 depending on three address lines (A0, A1, A2).
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```
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