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AH8502-FDC-7 Datasheet(PDF) 8 Page - Diodes Incorporated |
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AH8502-FDC-7 Datasheet(HTML) 8 Page - Diodes Incorporated |
8 / 19 page AH8502 Document number: DS37683 Rev. 1 - 2 8 of 19 www.diodes.com February 2015 © Diodes Incorporated AH8502 Application Note CNTRL Pin - Awake and Sleep Period and Operating Mode Control The CNTRL pin controls the device operating mode (Micropower, Turbo, External Drive modes) and “Awake” and “Sleep” periods during external drive mode. When the CNTRL pin is pulled low or GND continuously, the device operates in micropower mode with sampling rate of 24Hz and consumes only 13µA typical at 1.8V. The CNTRL pin is internally pulled low and therefore the default mode is micropower mode if the CNTRL pin is left floating. When CNTRL is pulled high CNTRL = VDD (or pulled high) continuously, the device runs in turbo Mode with sampling rate of 6.25kHz and consumes 1.01mA typical at 1.8V. When the CNTRL pin is pulled high continuously, the conversion time TCONV is 16 clock cycles (160µs typical) and therefore the sampling rate is 6.25kHz. If the CNTRL pin is driven externally with a PWM signal, the sampling rate can be adjusted from 24Hz to 7.14kHz. A minimum pulse width on CNTRL pin to start a sample/conversion is 20µs typical; we recommend using pulse width of 40µs minimum. In external drive mode with a PWM signal on the CNTRL pin, the conversion time (signal acquisition, conversion and output update) TCONV is 14 clock cycles (140µs typical). When the CNTRL goes high, the sample trigger delay is 1 clock pulse (10µs) where supply current remains at 8.93µA typical at VDD = 1.8V. After the sample trigger delay, the next 12 clock pulse (120µs typical) is „Awake‟ period where the typical supply current is 1.35mA at 1.8V supply. The next pulse (10µs) is used to update the output stage and during this time the supply current drops back to 8.93µA typical at 1.8V supply. Therefore, the average supply current of the device depends on the sampling frequency and at the maximum sampling rate of 7.14kHz, it is 1.16mA typical at 1.8V. The maximum sampling frequency is 7.14kHz when the CNTRL pin is externally driven with a PWM signal. For CNTRL pin clocking period of T, the average current is given by (@1.8V) (General equation) Quiescent Output Voltage VNULL and Offset Voltage The figure below shows the ideal transfer curve near zero magnetic field (B = 0Gauss). Zero Gauss is the transition point between VOUTPUT = VDD*127/128 and VOUTPUT = VDD/2. When B is slightly larger than zero, the output is one-half the supply voltage typically. Quiescent output voltage (VNULL) is defined as the typical output voltage when B = 0.5Gauss (slightly higher than 0G). Any difference of VNULL from VDD/2 introduces offset (VOFSET). VDD/2 Gauss Volts 0 +GRES VDD 127 256 VDD 126 256 VDD 129 256 -GRES Magnetic Flux Density (B) Transfer Curve Near 0 Gauss |
Similar Part No. - AH8502-FDC-7 |
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Similar Description - AH8502-FDC-7 |
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