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L9822N Datasheet(PDF) 6 Page - STMicroelectronics |
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L9822N Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 9 page CE Low to High Transition Once the last data bit has been shifted into the L9822NSP, the CE pin should be pulled high. At the rising edge of CE the shift register data is latched into the parallel latch and the output stages will be actuated by the new data. An internal 160 µs delay timer will also be started at this rising edge (see tUD). During the 160 µs period, the outputs will be protected only by the analog current limiting cir- cuits since the resetting of the parallel latches by faults conditions will be inhibited during this period. This allows the part to overcome any high inrush cur- rents that may flow immediately after turn on. Once the delay period has elapsed, the output voltages are sensed by the comparators and any output with voltages higher than 1.8V are latched OFF. It should be noted that the SCLK pin should be low at both transitions of the CE pin to avoid any false clocking of the shift register. The SCLK input is gated by the CE pin, so that the SCLK pin is ignored whenever the CE pin is high. FAULT CONDITIONS CHECK Checking for fault conditions may be done in the fol- lowing way. Clock in a new control byte. Wait 160 microseconds or so to allow the outputs to settle. Clock in the same control byte and observe the diag- nostic data that comes out of the device. The diag- nostic bits should be identical to the bits that were first clocked in. Any differences would point to a fault on that output. If the output was programmed ON by clocking in a zero, and a one came back as the di- agnostic bit for that output, the output pin was still high and a short circuit or overload condition exists. If the output was programmed OFF by clocking in a one, and a zero came back as the diagnostic bit for that output, nothing had pulled the output pin high and it must be floating, so an open circuit condition exists for that output. Figure 1 : Byte Timing with Asynchronous Reset. L9822N 6/9 |
Similar Part No. - L9822N_03 |
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Similar Description - L9822N_03 |
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