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MAX6970 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX6970 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page 16-Port, 36V Constant-Current LED Driver 8 _______________________________________________________________________________________ CLK is the serial-clock input, which shifts data at DIN into the MAX6971 16-bit shift register on its rising edge. LE is the latch load input of the MAX6971 that transfers data from the MAX6971 16-bit shift register to its 16-bit latch when LE is high (transparent latch), and latches the data on the falling edge of LE (Figure 2). The fourth input provides output-enable control of the output drivers. OE is high to force outputs OUT0–OUT15 high impedance, without altering the contents of the output latches, and low to enable out- puts OUT0–OUT15 to follow the state of the output latches. OE is independent of the operation of the serial inter- face. Data can be shifted into the serial-interface shift register and latched, regardless of the state of OE. DOUT is the serial-data output, which shifts data out from the MAX6971’s 16-bit shift register on the rising edge of CLK. Data at DIN is propagated through the shift register and appears at DOUT 16 clock cycles later. LE OUT_ LE OUT_ CLK OUT_ CLK OUT_ tCRR tCRF tLRR tLRF Figure 3. LE and CLK to OUT_ Timing Table 1. 4-Wire Serial-Interface Truth Table SHIFT-REGISTER CONTENTS LATCH CONTENTS OUTPUT CONTENTS SERIAL DATA INPUT DIN CLOCK INPUT CLK D0 D1 D2 …Dn-1 Dn LOAD INPUT LE D0 D1 D2 …Dn-1 Dn BLANKING INPUT OE D0 D1 D2 …Dn-1 Dn H HR1 R2 …Rn-2 Rn-1 — —— — — —— — — ———— — L LR1 R2 …Rn-2 Rn-1 — —— — — —— — —— — — — — X R0 R1 R2 …Rn-1 Rn — —— — — —— — —— — — — — —— XX X … XX H R0 R1 R2 —Rn-1 Rn — —— — — — — —— P1 P2 P3 …Pn-1 Pn L P0 P1 P2 …Pn-1 Pn L P0 P1 P2 … Pn-1 Pn —— —— —— —— — XX X … X X H Hi-Z Hi-Z Hi-Z … Hi-Z Hi-Z L = Low-logic level. H = High-logic level. X = Don’t care. P = Present state. R = Previous state. Hi-Z = High impedance. |
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