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ISL29044IROMZ-T7 датащи(PDF) 9 Page - Intersil Corporation |
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ISL29044IROMZ-T7 датащи(HTML) 9 Page - Intersil Corporation |
9 / 19 page ISL29044 9 FN8305.0 October 30, 2012 A proximity interrupt event (PROX_FLAG) is governed by the high and low thresholds in registers 3 and 4 (PROX_LT and PROX_HT). PROX_FLAG is set when the measured proximity data is more than the higher threshold X-times-in-a-row (X is set by user; see following paragraph). The proximity interrupt flag is cleared when the prox data is lower than the low proximity threshold X-times-in-a-row, or when the user writes “0” to PROX_FLAG. Interrupt persistency is another useful option available for both ALS and proximity measurements. Persistency requires X-in-a- row interrupt flags before the INT pin is driven low. Both ALS and Prox have their own independent interrupt persistency options. See ALS_PRST and PROX_PRST bits in Register 2. The final interrupt option is the ability to AND or OR the two interrupt flags using Register 2 Bit 0 (INT_CTRL). If the user wants both ALS/Prox interrupts to happen at the same time before changing the state of the interrupt pin, set this bit high. If the user wants the interrupt pin to change state when either the ALS or the Proximity interrupt flag goes high, leave this bit to its default of 0. ALS Range 1 Considerations When measuring ALS counts higher than 1800 on range 1 (ALSIR_MODE = 0, ALS_RANGE = 0, ALS_DATA > 1800), switch to range 2 (change the ALS_RANGE bit from “0” to “1”) and re-measure ALS counts. This recommendation pertains only to applications where the light incident upon the sensor is IR-heavy and is distorted by tinted glass that increases the ratio of infrared to visible light. For more information, please contact the factory. VDD Power-up and Power Supply Considerations Upon power-up, please ensure a VDD slew rate of 0.5V/ms or greater. After power-up, or if the user’s power supply temporarily deviates from our specification (2.25V to 3.63V), Intersil recommends the user write the following: write 0x00 to register 0x01, write 0x29 to register 0x0F, write 0x00 to register 0x0E, and write 0x00 to register 0x0F. The user should then wait ~1ms or more and then rewrite all registers to the desired values. If the user prefers a hardware reset method instead of writing to test registers: set VDD = 0V for 1 second or more, power back up at the required slew rate, and write registers to the desired values. Power-Down To put the ISL29044 into a power-down state, the user can set both PROX_EN and ALS_EN bits to 0 in Register 1 or more; simply set all of Register 1 to 0x00. Serial Interface The ISL29044 supports the Inter-Integrated Circuit (I2C) bus data transmission protocol. The I2C bus is a two wire serial bidirectional interface consisting of SCL (clock) and SDA (data). Both the wires are connected to the device supply via pull-up resistors. The I2C protocol defines any device that sends data onto the bus as a transmitter and the receiving device as the receiver. The device controlling the transfer is a master and the device being controlled is the slave. The transmitting device pulls down the SDA line to transmit a “0” and releases it to transmit a “1”. The master always initiates the data transfer, only when the bus is not busy, and provides the clock for both transmit and receive operations. The ISL29044 operates as a slave device in all applications. The serial communication over the I2C interface is conducted by sending the most significant bit (MSB) of each byte of data first. Start Condition During data transfer, the SDA line must remain stable while the SCL line is HIGH. All I2C interface operations must begin with a START condition, which is a HIGH to LOW transition of SDA while SCL is HIGH (refer to Figure 17). The ISL29044 continuously monitors the SDA and SCL lines for the START condition and does not respond to any command until this condition is met (refer to Figure 17). A START condition is ignored during the power-up sequence. Stop Condition All I2C interface operations must be terminated by a STOP condition, which is a LOW-to-HIGH transition of SDA while SCL is HIGH (refer to Figure 17). A STOP condition at the end of a read/write operation places the device in its standby mode. If a stop is issued in the middle of a Data byte, or before 1 full Data byte + ACK is sent, then the serial communication of ISL29044 resets itself without performing the read/write. The contents of the array are not affected. Acknowledge An acknowledge (ACK) is a software convention used to indicate a successful data transfer. The transmitting device releases the SDA bus after transmitting 8-bits. During the ninth clock cycle, the receiver pulls the SDA line LOW to acknowledge the reception of the eight bits of data (refer to Figure 17). The ISL29044 responds with an ACK after recognition of a START condition followed by a valid Identification Byte, and once again, after successful receipt of an Address Byte. The ISL29044 also responds with an ACK after receiving a Data byte of a write operation. The master must respond with an ACK after receiving a Data byte of a read operation. |
Аналогичный номер детали - ISL29044IROMZ-T7 |
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Аналогичное описание - ISL29044IROMZ-T7 |
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