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TDA5155 датащи(PDF) 11 Page - NXP Semiconductors |
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TDA5155 датащи(HTML) 11 Page - NXP Semiconductors |
11 / 24 page 1997 Apr 08 11 Philips Semiconductors Preliminary specification Pre-amplifier for Hard Disk Drive (HDD) with MR-read/inductive write heads TDA5155 8.7 Operation of the serial interface The serial interface programming is summarized in Section 8.7.10. 8.7.1 CONFIGURATION d0: By default (d0 = logic 0), write data passes from the write data input via the data flip-flop to the write driver. The write driver toggles the current in the head at the falling edges of: or When d0 = logic 1, the write data flip-flop is not used. The signal polarity is non-inverting from the inputs WDIx and WDIy to the outputs nWx and nWy. d1: By default (d1 = logic 0), the pre-amplifier senses PECL write signals at WDIx(v) and WDIy(v). When d1 = logic 1, the pre-amplifier senses input write currents at WDIx(i) and WDIy(i). d2: By default (d2 = logic 0), the write current is inhibited under low supply voltage conditions. The write current inhibit is made inactive by programming d2 to logic 1. d3: By default (d3 = logic 0), in write mode low supply voltage, open head, and other conditions are monitored and flagged at HUS. If d3 = logic 1, HUS is LOW in write mode and HIGH in read mode. d4: The amplifier read gain may be programmed in the configuration register. By default (d4 = logic 0), the read gain is typically 160 with RMR =28 Ω. If d4 = logic 1, the read amplifier gain is 3 dB higher (226 in this case). d5: In order to minimize the write-to-read recovery times, the first stage of the read amplifier may be kept biased during write mode. By default, (d5 = logic 0) the read amplifier is powered down during write mode, and the fast settling procedure is activated after write-to-read switching. If d5 = logic 1 the read amplifier is kept biased during write mode, and the fast settling procedure still occurs if the head is changed or the MR current is re-programmed. V data V WDIx v () V WDIy v () – 2 ------------------------------------------------------ = I data I WDIx i () I WDIy i () – 2 ---------------------------------------------- = 8.7.2 POWER CONTROL By default, d1 = d0 = logic 0, the pre-amplifier powers up in sleep mode. If d1 = logic 0, d0 = logic 1 or d1 = logic 1, d0 = logic 0 the circuit goes in standby mode. If d1 = d0 = logic 1, the circuit goes in active mode (read or write mode depending on the R/W input). 8.7.3 HEAD SELECT Selection of a wrong head (H10-H15) causes an head unsafe condition. HUS goes HIGH when in write mode a wrong head is selected and when d3 in the configuration register is LOW. When in read mode and a wrong head is selected, head H0 is therefore selected and if d3 in the configuration register is LOW, HUS goes LOW. 8.7.4 SERVO WRITE The circuit is prepared for servo writing. However, the device will not be guaranteed. 8.7.5 TEST d2 = d1 = d0 = logic 0. The circuit is not in test mode. This is the default situation. 8.7.5.1 MR head test d2 = logic 0, d1 = logic 0, d0 = logic 1. In read mode, the voltages at Rx and Ry (at the top of the MR elements) of the selected head are fed to outputs RDx and RDy. By measuring the output voltages single ended at two different IMR currents, the MR resistance can be accurately measured according to the following formula: for the x-side. Open head and head short-circuited-to-ground conditions can therefore be detected. d2 = logic 0, d1 = logic 1, d0 = logic 0. Same as before, with the difference that IMR2 is fixed to a minimum constant value of 5 mA. Measuring in the same way as above with IMR1 > 5 mA, enables the detection of MR elements shorted together. 8.7.5.2 Temperature monitor d2 = logic 0, d1 = logic 1, d0 = logic 1. The temperature monitor voltages are connected to RDx and RDy. The output differential voltage depends on the temperature according to: dV = −0.00364 × T + 1.7; 0 < T < 140 °C. The temperature may be measured with a typical precision of 5 °C. R MRx V RDx1 V RDx2 – I MRx1 I MRx2 – --------------------------------------- = |
Аналогичный номер детали - TDA5155 |
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Аналогичное описание - TDA5155 |
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