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ISL29018IROZ-T7 データシート(PDF) 8 Page - Intersil Corporation |
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ISL29018IROZ-T7 データシート(HTML) 8 Page - Intersil Corporation |
8 / 19 page ISL29018 8 FN6619.4 October 8, 2012 converted into current. With ADC, the current is converted to an unsigned n-bit (up to 16 bits) digital output. The output reading is inversely proportional to the square of the distance between the sensor and the object. Interrupt Function The active low interrupt pin is an open drain pull-down configuration. There is also an interrupt bit in the I2C register. The interrupt serves as an alarm or monitoring function to determine whether the ambient light level or the proximity detection level exceeds the upper threshold or goes below the lower threshold. The user can also configure the persistency of the interrupt. This reduces the possibility of false triggers, such as noise or sudden spikes in ambient light conditions. An unexpected camera flash, for example, can be ignored by setting the persistency to 8 integration cycles. Changing States - Avoiding Unintentional Interrupts A common application for the ISL29018 is alternating between ambient light and proximity measurements. The two states have different command words and threshold settings. To avoid an unintentional interrupt the device should be powered down before the state change. The conversion should not be enabled until the new command word & thresholds have been set. A safe sequence is to set the operation mode to power-down, set the command word and thresholds to the new state, then set the operation mode to desired setting. Example: State 0: Ambient light Operation Mode = ALS continuous Interrupt Persist = 1 Resolution = 16 bits Range = 1000 Lux Scheme, Frequency & IRDR = X (DONT CARE) Threshold High = 100 Lux Threshold Low = 10 Lux Command1 = 101x xx00 Command2 = xxxx 0000 Hi Threshold = 655 Lo Threshold = 66 State 1: Proximity - interrupt when NEAR Operation Mode = Proximity continuous Interrupt Persist = 4 Resolution = 12 bits Range = 1 Scheme = 1 Frequency = 0 IRDR = 100ma Threshold High = NEAR Threshold Low = OFF Command1 = 111x xx01 Command2 = 1011 0100 Hi Threshold = 1535 (75% of 2047) Lo Threshold = -2048 (OFF) Sequence State 0 -> State 1 Off: Write Byte Command1 = 0 State 1 setup: Write Word (Command 1&2) = B401h Write Word (Hi Threshold) = 05FFh Write Word (Lo Threshold) = F800h On: Write Byte Command1 = E1h Sequence State 1 -> State 0 Off: Write Byte Command1 = 0 State 0 setup: Write Word (Command 1&2) = B000h Write Word (Hi Threshold) = 028Fh Write Word (Lo Threshold) = 0042h On: Write Byte Command1 = A0h FIGURE 2. CHANGING STATES FLOW EXAMPLE |
同様の部品番号 - ISL29018IROZ-T7 |
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同様の説明 - ISL29018IROZ-T7 |
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