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Level Shifter Board
Features
• Level shifting of I C, SPI, and MDIO signals from 1.2 V to 3.3 V
• I C speeds of up to 800 kHz
2
• SPI and MDIO speeds of up to 20 MHz
• 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.
(注意)  
AardvarkをLevel Shifter BoardのAdapter/Analyzerコネクタに接続して使用する場合、 
Aardvarkがハングアップしてソフトの再起動やUSBの着脱が頻繁に必要になることがあります。 
これは、Aarvarkの 改造で発生しないようにすることができます。弊社にご相談ください。 
  
Level Shifter BoardのTARGET LEDは、単にTarget側(Level 変換後)の回路へ電源が来ているか 
どうかだけを示しています。ロットにも依存しますが点灯時の明るさの違いは無視してください。 
 
(注1) Level Shifter BoardのTARGET電源出力を外部で利用する場合の注意点。 
1.2Vか1.5Vの設定では、電源ON(5V入力)の瞬間、出力電圧が 1.8V程度になることが 
あります。それが問題になる場合は、弊社に改造等をご相談ください。 
2
(注1)
2
 
Supported products:
Level Shifter Board
User Manual v1.01
March 13, 2017

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Summary of Contents for Total Phase Level Shifter

  • Page 1 • 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.
  • Page 2: What's Included

    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.
  • Page 3 Level Shifter Board User Manual v1.01 • (1) 1.5-inch 10-pin ribbon cable • (3) jumpers for configuration...
  • Page 4: Hardware Specification

    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.
  • Page 5: Board Dimensions

    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.
  • Page 6 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.
  • Page 7 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...
  • Page 8 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}.
  • Page 9 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...
  • Page 10 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.
  • Page 11 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...
  • Page 12 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.
  • Page 13 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.
  • Page 14 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.
  • Page 15 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.
  • Page 16 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...
  • Page 17: Contact Information

    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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