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TLC5923 Datasheet(PDF) 10 Page - Texas Instruments |
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TLC5923 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 15 page ![]() www.ti.com Error Information Output TEF: Thermal Error Flag LOD: LED Open Detection LOD OUT15 15 0 MSB LSB LOD Data LOD OUT14 LOD OUT13 LOD OUT12 LOD OUT11 LOD OUT10 LOD OUT9 LOD OUT8 LOD OUT7 LOD OUT6 LOD OUT5 LOD OUT4 LOD OUT3 LOD OUT2 LOD OUT1 LOD OUT0 TLC5923 SLVS550 – DECEMBER 2004 The open-drain output XERR is used to report both of the TLC5923 error flags, TEF and LOD. During normal operating conditions, the internal transistor connected to the XERR pin is turned off. The voltage on XERR is pulled up to VCC through a external pullup resistor. If TEF or LOD is detected, the internal transistor is turned on, and XERR is pulled to GND. Since XERR is an open-drain output, multiple ICs can be OR'ed together and pulled up to VCC with a single pullup resistor. This reduces the number of signals needed to report a system error. To differentiate LOD and TEF signal from XERR pin, LOD can be masked out with BLANK = HIGH. Table 3. XERR Truth Table ERROR CONDITION ERROR INFORMATION SIGNALS TEMPERATURE OUNTn VOLTAGE TEF LOD BLANK XERR TJ < T(TEF) Don't Care L X H H TJ > T(TEF) Don't Care H X L TJ < T(TEF) OUTn > V(LOD) L L L H OUTn < V(LOD) L H L TJ > T(TEF) OUTn > V(LOD) H L L OUTn < V(LOD) H H L The TLC5923 provides a temperature error flag (TEF) circuit to indicate an overtemperature condition of the IC. If the junction temperature exceeds the threshold temperature T(TEF) (160°C typical), the TEF circuit trips and pulls XERR to ground. The TLC5923 provides an LED open-detection circuit (LOD). This circuit reports an error if any one of the 16 LEDs is open or disconnected from the circuit. The LOD circuit trips when the following two conditions are met simultaneously: 1. BLANK is set to LOW 2. When the voltage at OUTn is less than V(LOD) (0.3 V typ.) (Note: the voltage at each OUTn is sampled 1 µs after being turned on). The LOD circuit also pulls XERR to GND when tripped. The LOD status of each channel can also be read out from the TLC5923 SOUT pin. When MODE is low and On/Off data is latched with rising edge of XLAT, LOD data is written to the input shift register with the falling edge of XLAT. These LOD data is clocked out to SOUT when new On/Off data is clocked in. These allow to control the LOD status of each OUTn channel. Figure 12 shows the LOD data format. Figure 12. LOD Data 10 |
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