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PCA9922BS Datasheet(PDF) 9 Page - NXP Semiconductors |
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PCA9922BS Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 27 page PCA9922 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 2 — 6 April 2011 9 of 27 NXP Semiconductors PCA9922 8-channel constant current LED driver with output error detection 7.2.4 Setting the outputs to test Before the Capture Fault sequence may be performed, the outputs must be set up. A logic HIGH must be sent to the output control register for all eight bits. This is done after the Enter Error Detect sequence is performed as a normal data load sequence as seen in Figure 5. Please note that this process is completely destructive to the data that is stored in the output control register (and the LED[7:0] pins). The output control register will have to be restored to its proper values by the user after the error detect sequence has been completed. 7.2.5 Capturing the fault/output error data The Capture Fault/Error Data sequence can only follow the Enter Error Detect sequence. If the Error Detect sequence has not occurred, this sequence will be treated as a normal operational sequence. Once the Capture Fault sequence has occurred, an Exit Error Detect sequence should be performed. There can be no more Capture Sequences until another Enter Error Detect sequence has occurred. The Capture Fault Sequence consists of holding OE LOW for no less than 3 clocks (CLK) and for a minimum of 2 μs, whichever is longer. During this period of time, the shift register is being loaded with the fault status. As such, data presented to the device via SDI will not be captured. Bit 7 of the fault data will be present on SDO by the first falling edge CLK after the user de-asserts OE for this cycle. An error condition is output as a 1 (HIGH bit), and a 0 (LOW bit) designates a normal status. Timing for this sequence is shown in Figure 7. Fig 7. Timing for ‘Capture Fault Mode’ command CLK LE OE 002aad205 OE = 1'b0 for minimum of 3 clocks or 2 μs, whichever is longer SDO previous serial data fault data MSB resume shift with fault data |
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