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DRV8870: DRV8870 for latching solenoid driver

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Part Number:DRV8870

Hi - 

I'm trying use the TI DRV8870 (http://www.ti.com/lit/ds/symlink/drv8870.pdf) to open and close a 24V latching solenoid (http://www.deltaww.com/filecenter/Produ ... S-0730.pdf) using a Raspberry Pi 3 for some prototyping work. The solenoid takes a 24V pulse for 45 ms to open and then a reverse polarity pulse to close. 

I've wired the Pi and DRV chip as follows:

However, I'm not getting any output voltage from the chip. 

Can anyone offer any guidance as to what I've got wrong?


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