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TLC5941RHBR Fiches technique(PDF) 11 Page - Texas Instruments |
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TLC5941RHBR Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 23 page www.ti.com PRINCIPLES OF OPERATION SERIAL INTERFACE SCLK SOUT SIN MODE Vcc DC n MSB GS MSB X 1 1 XLAT DC n LSB 96 192 GS LSB 193 DC n+1 MSB DC n+1 MSB−1 1 DC n MSB DC n LSB DC MSB GS MSB SID MSB X 2 th3 tsu3 th3 tsu2 th2 tsu2 th2 DC Mode Data Input Cycle GS Mode Data Input Cycle DC Mode Data Input Cycle X ERROR INFORMATION OUTPUT TLC5941 SLVS589 – JULY 2005 The TLC5941 includes a flexible serial interface, which can be connected to microcontrollers or digital signal processors in various ways. Only 3 pins are needed to input data into the device. The rising edge of SCLK signal shifts the data from the SIN pin to the internal register. After all data is clocked in, a rising edge of XLAT latches the serial data to the internal registers. All data are clocked in with the MSB first. Multiple TLC5941 devices can be cascaded by connecting the SOUT pin of one device with the SIN pin of the following device. The SOUT pin can also be connected to the controller to receive status information from the TLC5941. The serial data format is 96-bit or 192-bit wide, depending on programming mode of the device. Figure 6. Serial Data Input Timing Chart The open-drain output XERR is used to report both of the TLC5941 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 an external pullup resistor. If TEF or LOD is detected, the internal transistor is turned on, and XERR is pulled to GND. Because XERR is an open-drain output, multiple ICs can be ORed together and pulled up to VCC with a single pullup resistor. This reduces the number of signals needed to report a system error (see Figure 13). To differentiate LOD and TEF signal from XERR pin, LOD can be masked out with BLANK = HIGH. Table 1. XERR Truth Table ERROR CONDITION ERROR INFORMATION SIGNALS TEMPERATURE OUTn VOLTAGE TEF LOD BLANK XERR TJ < T(TEF) Don't Care L X H H TJ > T(TEF) Don't Care H X L OUTn > V(LED) L L H TJ < T(TEF) OUTn < V(LED) L H L L OUTn > V(LED) H L L TJ > T(TEF) OUTn < V(LED) H H L 11 |
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Description similaire - TLC5941RHBR |
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