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| author | Martin Braun <martin.braun@ettus.com> | 2022-03-07 14:32:40 +0100 |
|---|---|---|
| committer | Aaron Rossetto <aaron.rossetto@ni.com> | 2022-04-06 14:31:56 -0700 |
| commit | 1380b91e542d1280372de6fa8d712574692e9e66 (patch) | |
| tree | 89a4897523dd2375ec637c2f43881676f3f790b5 /host/docs/gpio_api.dox | |
| parent | 9738209380a8104b371f3eff03f9772daa15060d (diff) | |
| download | uhd-1380b91e542d1280372de6fa8d712574692e9e66.tar.gz uhd-1380b91e542d1280372de6fa8d712574692e9e66.tar.bz2 uhd-1380b91e542d1280372de6fa8d712574692e9e66.zip | |
docs: e31x: Update information on GPIO pin header
- Note on drawing power from the 3.3V rail
- Clarified purpose of Pins 2 and 4 (peripheral I2C bus)
Diffstat (limited to 'host/docs/gpio_api.dox')
| -rw-r--r-- | host/docs/gpio_api.dox | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/host/docs/gpio_api.dox b/host/docs/gpio_api.dox index 82e5fa253..b046e89b9 100644 --- a/host/docs/gpio_api.dox +++ b/host/docs/gpio_api.dox @@ -50,9 +50,9 @@ The +3.3V is for ESD clamping purposes only and not designed to deliver high cur ### Pin Mapping - Pin 1: +3.3V -- Pin 2: Reserved +- Pin 2: I2C SCL (3.3 V) - Pin 3: Data[5] -- Pin 4: Reserved +- Pin 4: I2C SDA (3.3 V) - Pin 5: Data[4] - Pin 6: Data[0] - Pin 7: Data[3] @@ -60,6 +60,11 @@ The +3.3V is for ESD clamping purposes only and not designed to deliver high cur - Pin 9: 0V - Pin 10: Data[2] +Pin 1 is connected to the shared +3.3V power rail and can be used to draw power. +The maximum current depends on the power used by the rest of the device, but +300-500 mA is generally safe. It is recommended to monitor the rail voltage +when drawing power from this pin. + \subsection e320_gpio_conn E320 External GPIO connector ### Front Panel GPIO Connections |