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SXTA42E-6327 Datasheet
SXTA42E-6327 Price NULL COUNT bit D6 indicates when the last count written to the counter register (CR) has been loaded into the counting element (CE). The exact time this happens depends on the Mode of the counter and is described in the Mode Definitions, but until the count is loaded into the counting element (CE), it can't be read from the counter. If the count is latched or read before this time, the count value will not reflect the new count just written. The operation of Null Count is shown in Figure 12. SXTA42E-6327 on stock Variable 100mA t0 2A Current Source In the circuit of Fig.8 the output cu rrent is set by the resistor R in the collector of TR2, which may be switched to offer a range ofoutput currents from 100mA t0 2A with fine control by means of VR3 which varies the reference voltage to the non- inverting input of the ZN424P. The feedback path from the output to theinverting input of the ZN424P maintains a constant voltage across R, equal to (Vce - VIN) and hence a constant current to the load given by (Vce - VIN)/R.
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