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• Powering downstream devices • Multiple voltage options Summary The Level Shifter Board expands the utility of all of Total Phases I C, SPI, and MDIO products by allowing developers to communicate, analyze, and power downstream devices of lower logic levels.
The Level Shifter Board provides embedded systems engineers with an easy and cost- effective method for interfacing Total Phase's products with lower logic level devices. The Level Shifter Board is capable of down-shifting to all standard logic levels from 1.2 V to 3.3 V. Engineers can also choose to power downstream devices.
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Level Shifter Board User Manual v1.01 • (1) 1.5-inch 10-pin ribbon cable • (3) jumpers for configuration...
The Level Shifter Board has been tested to operate at up to 18 MHz when shifting to 1.2 V, and up to 20 MHz when shifting to 3.3 V. When operating at higher speeds, shorter cables are recommended to help maintain signal integrity.
2.4 Leakage Voltage The Level Shifter Board is known to leak approximately 0.2 V to the Target side, even when configured to not supply power to the target. This is a very weak leakage which is only capable of sourcing approximately 20 µA of current.
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Shifter Board. Figure 3 : Two boxed connectors for connecting an adapter and/or analyzer to the Level Shifter Board. The second connector may be used to connect a second host adapter. Examples of these situations are: in order to have more slaves, or to create a multi-master situation.
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There are two boxed connectors on the left side (Target side) of the Level Shifter Board (Figure 5 ) which are used to connect the target bus to the level shifter. The signal lines on these connectors are operating at the voltage levels specified by the user. This level can either be specified on the board through the use of the jumper connectors, or can be...
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The pinout of the two connectors is described in Figure 6. Figure 6 : The pinout for the two boxed connectors on the Target side of the Level Shifter Board. 3.3 EXT 3.3V and EXT TGT All the bus and power signals on the board are also available through two 16-pin headers on the board (Figure 7}.
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The Target side (the low voltage side) can optionally be powered by the power already supplied to the Level Shifter Boardor by the target device. If powering the Target side by the target device, simply connect the device's power to the TPWR pin on the EXT TGT or...
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If powering the Target side by the power already supplied on the board, then a jumper must be placed to enable this feature (Figure 9 ). Refer to Section 4 for more details. Figure 9 : When supplying power from the Level Shifter Board to the target, a jumper needs to be place on TPWR.
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Level Shifter Board User Manual v1.01 3.5 Cross Connecting Aardvark Adapters and/or Cheetah Adapters When cross connecting two adapters, the board must be powered on. Otherwise, results may be unpredictable. If you experience problems, please make sure that the POWER...
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There are two options for selecting the Target side logic level. The first method is to use the power supplied to the Level Shifter Board to power the target device. In this method, the output voltage must be enabled by placing a jumper on the TPWR pins.
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Selections are made by placing a jumper on one of the headers. Their uses are described below: Figure 11 : The Level Shifter Board must be configured from the correct mode of operation when using this board to interface with an SPI or an MDIO bus.
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Level Shifter Board User Manual v1.01 side logic level. The SS#, SCK, and MOSI line will be left in their default enabled state, and will be shifted up to the Adapter/Analyzer's logic level. • MONITOR: When selected, will leave all SPI lines in their default enabled state, and will therefore be shifted up to the Adapter/Analyzer side logic level.
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Level Shifter Board User Manual v1.01 The I Clines do not require any directional configuration as it is a bi-directional bus. Each I C line may go in a different direction, and can also be swapped on the fly.
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Total Phase product could cause personal injury or loss of life. Should a Total Phase product be used in such an unauthorized manner, Buyer agrees to indemnify and hold harmless Total Phase, its...
Level Shifter Board User Manual v1.01 use, even if such claim alleges that Total Phase was negligent in the design or manufacture of its product. 5.3 Contact Information Total Phase can be found on the Internet at http://www.totalphase.com/. If you have support-related questions, please go to the Total Phase website.
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