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3.3.2.4PCM Interface
Signal Name | Pin No | I/O | Signal level | Comments |
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PCM_CLK | 20 | I or O | O/P : VOLmax=0.2V | If unused keep pins open |
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| VOHmin=2.8V |
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| I/P : VILmax=0.8V |
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| VIHmin=2.1V |
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| VIHmax=3.7V |
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PCM_IN | 22 | I | VILmax=0.8V |
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| VIHmin=2.1V |
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| VIHmax=3.7V |
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PCM_SYNC | 24 | I or O | O/P : VOLmax=0.2V |
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| VOHmin=2.8V |
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| I/P : VILmax=0.8V |
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| VIHmin=2.1V |
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| VIHmax=3.7V |
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PCM_OUT | 26 | O | VOLmax=0.2V |
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| VOHmin=2.8V |
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3.3.2.5General Purpose I/O and ADC
Signal Name | Pin No | I/O | Signal level | Comments |
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GPIO 1 - 9 | 2,4,12, | I or O | O/P : VOLmax=0.2V |
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| 14,16, |
| VOHmin=2.8V |
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| 33, 35, |
| I/P : VILmax=0.8V |
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| 37, 39 |
| VIHmin=2.1V |
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| VIHmax=3.7V |
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AIO_0, AIO_1 | 1, 3 | I | Range 0 – 1.8V |
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3.3.2.6Miscellaneous
Function | Signal Name |
Reserved | USB D- |
Reserved | USB D+ |
Reset | RESET |
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Terminology: |
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Pin No
32
34
13
I/O
I
I
I
Signal level
VILmax =0.3vdd_usb VIHmin =0.7vdd_usb
VILmax =0.3vdd_usb VIHmin =0.7vdd_usb
Threshold 2.6V
Comments
Normally inactive. Pull to GND through 10K
Normally inactive. Pull to GND through 10K
Active HIGH
USB Signal Levels. vdd_usb refers to the internal voltage generated by the LDO regulator on the module, which is typically 3.3V. Hence 0.3vdd_usb and 0.7vdd_usb correspond to 1.0V to 2.3V. If Vcc falls below the recommended minimum of 3.6V, these values will be reduced.