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STMPE1601 Datasheet(PDF) 13 Page - STMicroelectronics |
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STMPE1601 Datasheet(HTML) 13 Page - STMicroelectronics |
13 / 61 page STMPE1601 I2C interface 13/61 6.1 Minimizing current drain on I2C address lines The GPIOs 13-15 are used as I2C address input during POR. Pull-up/down resistor of 500 K-1.5 M is recommended for these address lines. In the case that these pins are driven to an opposite logic level during device operation, there would be a current drain of VIO/R. This amounts to a significant current for portable devices. To minimize the current drain on I2C lines, a few methods are recommended. 1. If maximum keypad size is not required, these shared lines should not be used for keypad operation. 2. If the maximum keypad size is required, choose I2C address 0x40, as this requires that all 3 address lines to be pulled to ground, minimizing the current drain in keypad operation. In this mode of operation, the pull up/down resistors on the I2C lines should be: A reset circuit with longer RC is used to ensure enough time for the address lines to settle to the final values. 3. In system-controlled idle state, all keypad pins to be configured as hotkey with interrupt enabled. If any key is pressed, system initiates keypad controller for scanning operation. Table 13. Recommended pull up/down resistors on the I2C lines VIO 1.8 V 2.5 V 3.3 V Reset RC or pulse width(1) 1. Recommended values are chosen to minimize leakage current. Note RPU/RPD 1.5 M 1.2 M 1 M 270 K/0.47 μF 120 ms All 3 address lines are used for keypad controller RPU/RPD 1.0 M 800 K 660 K 180 K/0.47 μF 80 ms 2 address lines are used for keypad controller RPU/RPD 500K 400K 330K 90K/0.47 μF 40 ms 1 address line is used for keypad controller |
Similar Part No. - STMPE1601_1 |
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Similar Description - STMPE1601_1 |
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