| 전자부품 데이터시트 검색엔진 |
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ADM1026JSTZ-R7 데이터시트(PDF) 30 Page - ON Semiconductor |
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ADM1026JSTZ-R7 데이터시트(HTML) 30 Page - ON Semiconductor |
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30 / 55 page ![]() ADM1026 http://onsemi.com 30 Notes: For a NAND tree test to work, all outputs (INT, RSTMAIN, RSTSTBY, and PWM) must remain high during the test. When generating test waveforms, allow for a typical propagation delay of 500 ns through the NAND tree. If any of the inputs shown in Figure 55 are unused, they should not be connected direct to ground, but via a resistor such as 10 k W. This allows the automatic test equipment (ATE) to drive every input high so that the NAND tree test can be properly carried out. Figure 56. NAND Tree Test Taking Inputs High in Turn GPIO16 GPIO15 GPIO14 GPIO13 GPIO12 GPIO11 GPIO10 GPIO9 GPIO8 FAN0 FAN3 FAN4 FAN5 FAN6 FAN7 CI INT NTESTOUT FAN1 FAN2 SCL SDA In the event of an input being nonfunctional (stuck high or low) or two inputs shorted together, the output pattern is different. Some examples are given in Figure 58 through Figure 60. Figure 58 shows the effect of one input being stuck low. The output pattern is normal until the stuck input is reached. Because that input is permanently low, neither it nor any inputs further up the tree can have any effect on the output. Figure 57. NAND Tree Test Taking Inputs Low in Turn INT CI SDA SCL FAN7 FAN6 FAN3 FAN2 FAN1 GPIO11 GPIO12 GPIO15 FAN5 FAN4 FAN0 GPIO10 GPIO13 GPIO14 GPIO9 GPIO8 NTESTOUT GPIO16 Figure 58. NAND Tree Test with GPIO11 Stuck Low GPIO16 GPIO15 GPIO14 GPIO13 GPIO12 GPIO11 GPIO10 GPIO9 GPIO8 FAN0 NTESTOUT FAN1 Figure 59 shows the effect of one input being stuck high. Taking GPIO12 high should take the output high. However, the next input up the tree, GPIO11, is already high, so the output immediately goes low again, causing a missing pulse in the output pattern. |
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