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CAT522WI-TE10 Datasheet(PDF) 7 Page - Catalyst Semiconductor |
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CAT522WI-TE10 Datasheet(HTML) 7 Page - Catalyst Semiconductor |
7 / 11 page CAT522 7 Doc. No. 2004, Rev. E Figure 3. Temporary Change in Output same as that which had been there previously no change in the DPP’s output is noticed. Had the value held in the control register been different from that stored in non- volatile memory then a change would occur at the read cycle’s conclusion. TEMPORARILY CHANGE OUTPUT The CAT522 allows temporary changes in DPP’s output to be made without disturbing the settings retained in non-volatile memory. This feature is particularly useful when testing for a new output setting and allows for user adjustment of preset or default values without losing the original factory settings. Figure 3 shows the control and data signals needed to effect a temporary output change. DPP wiper settings may be changed as many times as required and can be made to any of the two DPPs in any order or sequence. The temporary setting(s) remain in effect long as CS remains high. When CS returns low all two DPPs will return to the output values stored in non-volatile memory. When it is desired to save a new setting acquired using this feature, the new value must be reloaded into the DPP wiper control register prior to programming. This is because the CAT522’s internal control circuitry discards from the programming register the new data two clock cycles after receiving it if no PROG signal is received. Amplified DPP Output APPLICATION CIRCUITS Bipolar DPP Output D0 D1 D2 D3 D4 D5 D6 D7 A0 A1 D0 D1 D2 D3 D4 D5 D6 D7 1 NEW DPP DATA CURRENT DPP DATA DO DI CS PROG DPP OUTPUT t 1 2 3 4 5 6 7 8 9 10 11 12 N N+1 N+2 o CURRENT DPP VALUE NON-VOLATILE NEW DPP VALUE VOLATILE CURRENT DPP VALUE NON-VOLATILE RDY/BSY MSB LSB 1111 1111 —— (.98 V ) + .01 V = .990 V V = +4.90V 1000 0000 —— (.98 V ) + .01 V = .502 V V = +0.02V 0111 1111 —— (.98 V ) + .01 V = .498 V V = -0.02V 0000 0001 —— (.98 V ) + .01 V = .014 V V = -4.86V 0000 0000 —— (.98 V ) + .01 V = .010 V V = -4.90V REF REF REF IF V = 5V REF 255 255 OUT DPP INPUT DPP OUTPUT ANALOG R = R OUTPUT REF REF REF OUT 128 255 127 255 REF REF REF OUT 1 255 REF REF REF OUT REF REF REF OUT 0 255 V = 0.99 V FS REF V = 0.01 V ZERO REF V = ——— (V - V ) + V DPP CODE 255 FS ZERO ZERO CAT522 GND VDD VREFH VREFL CONTROL & DATA + – OP 07 VOUT -15V +15V +5V RR I F V = (1 + –––) V OUT DPP RF RI CAT522 GND VDD VREFH VREFL CONTROL & DATA + – OP 07 V = ( ) -V OUT RF R + i -15V +15V +5V RR i F Ri i RF V DPP For R = i RF V = 2V -V OUT i DPP Vi VOUT |
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