PI3VST01 HPD signal Generator for VGA Features Description ÎÎHot Plug Detect Signal Generator for VGA connectors The VGA connector does not have a hot-plug pin to tell the system that a monitor is connected. More recent video standards, such as HDMI and DisplayPort, save power by adding a hot-plug pin which allows graphics outputs to be powered down when a monitor is not connected. ÎÎGenerates hot plug output signal telling system when monitor is present or not ÎÎPower Supply, 3.3V and 5.0V ÎÎESD tolerance on pin 7 is up to +/-4kV contact per Pericom’s PI3VST01 HPD signal generator generates a monitor detection signal from a VGA source connector to tell the VGA source if an external monitor is connected or not. IEC61000-4-2 specification ÎÎ-3dB BW of 1.7GHz (typ) ÎÎ4.75 Ohm On Resistance with 0.5 Ohm flatness (typ) PI3VST01 allows notebook makers to shut off the VGA DAC when a monitor is not connected, thus saving 170 mW per DAC. PI3VST01 dissipates only 0.66 mW. ÎÎLow input/output capacitance (Con = 4.5pF, typ) ÎÎPackaging (Pb-free and Green): àà 8-contact MSOP (U) The monitor detection scheme within the PI3VST01 will not affect normal operation of the video driver. Pin Configuration-U8 (Top View) Block Diagram V V BOUT 5 V VDD3 6 Detector HPD_OUT 7 Logic Control 8 VSYNC 4 VSYNC 3 BIN 2 VDD5 BOUT BIN 1 GND Rref HPD_OUT RREF All trademarks are property of their respective owners. 15-0090 1 www.pericom.com07/08/15 PI3VST01 HPD signal Generator for VGA Pinout Table Pin # Pin Name 1 GND Ground Ground 2 VDD5 Power 5V ± 10% power rail 3 BIN I Blue input from VGA source 4 VSYNC I Vertical Synchronization signal, internal 250KOhm pulldown 8 I/O Type HPD_OUT O 7 VDD3 6 BOUT 5 Rref Description Open drain output, telling the system the status of the external VGA monitor. If VGA monitor is present, this pin will be pulled low. If VGA monitor is not present, this pin will be Hi-z Power 3.3V ± 10% power rail O Blue output to VGA connector I/O Determines IC mode in terms of impedance detection levels. connect to external resistor to GND. Resistor values can be determined by looking at truth table All trademarks are property of their respective owners. 15-0090 2 www.pericom.com07/08/15 PI3VST01 HPD signal Generator for VGA Absolute Ratings (Above which the useful life may be impaired. For user guidelines, not tested) Note: VDD3 (Power Supply)……….......……….…..-0.5V to 4.0V Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress VDD5 (Power Supply)..........................................-0.5V to 6V o o rating only and functional operation of the device at these or Storage Temperature…………........………-55 C to +150 C any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. DC Electrical Characteristics for Video Switching over Operating Range (TA= –40°C to +85°C, VDD3 = 3.3V±10%, VDD5 = 5.0V±10%) Parameters Description Test Conditions Min. Typ. Max. Units Switch On-Resistance, BIN to BOUT VDD = Min., 0V ≤ Vinput ≤ 1.2V, Iinput = –40mA - R FLAT(ON) On-Resistance Flatness, BIN to BOUT VDD = Min., Vinput @ 0V and 1.2V, Iinput = –40mA - VIH,VSYNC Input High Voltage, VSYNC 2.4 VIL,VSYNC Input Low Voltage, VSYNC 0 0.5 V VOL,HPD_OUT Output Low Voltage, HPD_OUT IOL=2mA 0 0.4 V IIL Input leakage current, BIN VIN = 0V -1 1 uA IIH Input leakage current, BIN VIN = 3.6V -1 1 uA IOZL Output leakage current, BOUT VOUT= 0V -1 1 uA IOZH Output leakage current, BOUT VOUT = 3.6V -1 1 uA IOZH,HPD_OUT Output Leakage Current, HPD_OUT VOZ =VDD 1 uA RON 4.75 5.5 ohm 0.5 1 V Power Supply Characteristics (TA= –40°C to +85°C) Parameters Description Min. Typ. Max. Units IDD3 Current Consumption for 3.3V Rail, case 75//75 or 150//75 200 400 uA IDD5 Current Consumption for 5V Rail, case 75//75 or 150//75 0.5 1 uA All trademarks are property of their respective owners. 15-0090 3 www.pericom.com07/08/15 PI3VST01 HPD signal Generator for VGA Dynamic Electrical Characteristics over Operating Range (TA=-40º to+85ºC, VDD3 =3.3V±10%, GND=0V, VDD5 = 5.0V±10%) Parameters Description OIRR BW tPD ILOSS OFF Isolation, BIN to BOUT Test Conditions Min. f = 250MHz Bandwidth –3dB, BIN to BOUT Propagation Delay, BIN to BOUT Insertion Loss for B path with 75-Ohm load Typ. Max. Units - -46 - dB - 2.0 - GHz - 90 - ps Freq = 10MHz (VGA) -0.3 Freq = 100MHz (XGA) -0.33 Freq = 300MHz (UXGA) -0.4 dB Capacitance (TA = 25°C, f = 1MHz) Parameters Description Test Conditions Typ. Units COFF Capacitance, Switch OFF 2.4 pF CON Switch Capacitance between BIN and BOUT, Switch ON 5.6 pF Applications VGA-DACs in chipsets as well as video chips (MXM, GPU, DP-to-VGA, PCIe, etc.) typically dissipate about 170 mW. The VGA standard does not have a monitor detect feature, so the DAC dissipates power whether the monitor is connected or not. PI3VST01 provides an HPD_OUT signal that detects the presence of a monitor. This HPD_OUT signal can be routed to the chipset, directly, or through an MPU, to turn off the VGA DAC when a monitor is not connected. Using the PI3VST01, the system can save 170 mW when the monitor is not connected. PI3VST01 can also be used to enable automatic switching between two monitors. Another Pericom product, PI3V724 integrates 2 monitor detection circuits with a 1:2 VGA switch and offers both automatic and manual monitor switching. VGA Termination PI3VST01 can support two different termination schemes: 1. Case_75//75: Reverse termination for the monitor is provided by a 75 Ohm resistor at the connector, as per the VESA VSIS specification. 2. Case_150//75: Reverse termination for the monitor is split between a 150 Ohm resistor at the connector and a 150 Ohm resistor at the video DAC, as required by some chipsets. An external resistor must be supplied between the Rref pin and ground to tell the detection circuit which termination scheme is being used. Values for this resistor are shown below. Rref 330Kohm +/-5% Application Case Supported Case _150//75 200Kohm +/-5% Case _75//75 All trademarks are property of their respective owners. 15-0090 4 www.pericom.com07/08/15 PI3VST01 HPD signal Generator for VGA Application Schematics In order to ensure accurate color balance, gain and frequency response are matched between the R, G, and B channels using: • 4.7 Ohm resistors in series with the R and G lanes, • 8.2 pF capacitors to ground from the R and G lanes, and • a 2 pF capacitor to ground on the B lane. To pass the VESA VSIS specification, many VGA DACs require series inductors to reduce overshoot and undershoot. A 47 kOhm resistor is used as a pullup for the open-drain HPD_OUT signal from the PI3VST01 to the VGA DAC control. 4.7 uF capacitors should be used to bypass both VDD5 and VDD3. The schematic below illustrates the recommended design for the 150//75 case. All trademarks are property of their respective owners. 15-0090 5 www.pericom.com07/08/15 PI3VST01 HPD signal Generator for VGA The schematic below illustrates the recommended design for the 75//75 case. Total power dissipation of this solution is very small. PI3VST01 power dissipation is 0.66 mW typical, which is a small fraction (<1%) of the 170 mW saved when the monitor is not connected. All trademarks are property of their respective owners. 15-0090 6 www.pericom.com07/08/15 PI3VST01 HPD signal Generator for VGA Packaging Mechanical: 8-Pin MSOP (U) 14-0272 Please check for the latest package information on the Pericom web site at www.pericom.com/packaging/ Ordering Information Ordering Code Package Code Package Description PI3VST01UE U 8-pin, Mini Small Outline Package (MSOP) PI3VST01UEX U 8-pin, Mini Small Outline Package (MSOP), Tape & Reel • Thermal characteristics can be found on the company web site at www.pericom.com/packaging/ • E = Pb-free and Green • X suffix = Tape/Reel Pericom Semiconductor Corporation • 1-800-435-2336 All trademarks are property of their respective owners. 15-0090 7 www.pericom.com07/08/15