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DS3502UT Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS3502UT Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 10 page High-Voltage, NV, I2C POT _______________________________________________________________________________________ 9 Manipulating the address counter for reads: A dummy write cycle can be used to force the address counter to a particular value. To do this the master gen- erates a START condition, writes the slave address byte (R/W = 0), writes the memory address where it desires to read, generates a repeated START condi- tion, writes the slave address byte (R/W = 1), reads data with ACK or NACK as applicable, and generates a STOP condition. See Figure 3 for a read example using the repeated START condition to specify the starting memory location. Applications Information Power-Supply Decoupling To achieve the best results when using the DS3502, decouple both the power-supply pin (VCC) and the wiper-bias voltage pin (V+) with a 0.01µF or 0.1µF capacitor. Use a high-quality ceramic surface-mount capacitor if possible. Surface-mount components mini- mize lead inductance, which improves performance, and ceramic capacitors tend to have adequate high- frequency response for decoupling applications. SDA and SCL Pullup Resistors SDA is an I/O with an open-collector output that requires a pullup resistor to realize high-logic levels. A master using either an open-collector output with a pullup resistor or a push-pull output driver must be used for SCL. Pullup resistor values should be chosen to ensure that the rise and fall times listed in the I2C AC Electrical Characteristics are within specification. A typ- ical value for the pullup resistors is 4.7k Ω. SLAVE ADDRESS* START START 0 1 0 1 0 A1 A0 R/W SLAVE ACK SLAVE ACK SLAVE ACK MSB LSB MSB LSB MSB LSB b7 b6 b5 b4 b3 b2 b1 b0 READ/ WRITE REGISTER ADDRESS b7 b6 b5 b4 b3 b2 b1 b0 DATA STOP SINGLE-BYTE WRITE REGISTER 00h SINGLE-BYTE READ -READ CR REGISTER START REPEATED START 51h MASTER NACK STOP 0 1010000 00000 010 02h 01010 001 0 1010000 00000 000 50h 00h STOP DATA EXAMPLE I2C TRANSACTIONS (WHEN A0 AND A1 ARE CONNECTED TO GND). TYPICAL I2C WRITE TRANSACTION *THE SLAVE ADDRESS IS DETERMINED BY ADDRESS PINS A0 AND A1. DATA 50h A) B) SLAVE ACK SLAVE ACK SLAVE ACK SLAVE ACK SLAVE ACK SLAVE ACK Figure 3. I2C Communication Examples |
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