Datasheet

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Serial Mode

Once the SPUSI2 board drivers and TinyI2CSPI software are installed, the appropriate pins on the

LMH6517 board need to be connected to the SPUSI2 board. Soldering jumpers is one easy method.

Connect the CLK, SDI and CS pins as well as a ground wire to the SPUSI2 board. The board software

should be set to SPI mode and the CS adn CKPOL columns should be set to 1. The CKPHA column

needs to be set to 1and the number of bits should be set to 16. Check to the LMH6517 data sheet for

details on the data to be sent to the DVGA registers. Some simple SPI commands, as well as the proper

software settings are shown below in Figure 9.

Table 3. Header Jack Pin Assignments (J1)

Header Pin LMH6517 Pin # Parallel Function Serial Function Pulse Function

J1–1 3 Address bit 5 N/A N/A

J1–2 2 Address bit 4 CLK Up A

J1–3 1 Address bit 3 Serial Data In Down A

J1–4 32 Address bit 2 Chip Select Step Size MSB

J1–5 31 Address bit 1 Serial Data Out Step Size LSB

J1–6 25 Address bit 0 N/A N/A

J1–7 22 Enable A Enable A Enable A

J1–8 21 Latch A N/A N/A

J1–9 N/A Ground Ground Ground

SNOA553B–October 2010–Revised May 2013 AN-2081 LMH6517EVAL-R1 Evaluation Board

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