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The USB interface meets the requirements of USB specifictions specifications 2.0:
Symbol | Parameter | Conditions | Min | Typ | Max | Unit | |
|---|---|---|---|---|---|---|---|
Input levels | VDI | Diff. Input sensitivity | 0.2 | - | - | V | |
VCM | Diff. common mode range | 0.8 | 2.5 | ||||
VSE | Single ended receiver threshold | 1.3 | 2 | ||||
Output levels | VOL | Output level low | 1.5kΩ to VDD | - | - | 0.3 | |
VOH | Output level high | 15kΩ to VSS | 2.8 | - | 3.6 | ||
RPD | D+/D- | VIN=VDD | 17 | 21 | 24 | kΩ | |
RPU | D+/D- | VIN=VSS | 1.5 | 1.8 | 2.1 | ||
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USB full speed timings: the definitions of data signal rise and fall time are presented in the following table and figure:
Driver characteristcscharacteristics | ||||
|---|---|---|---|---|
Symbol | Parameter | Conditions | Min | Max |
tr | Rise time | CL = 50pF | 4 | 20 |
tf | Fall time | CL = 50pF | 4 | 20 |
trfm | Rise/fall time matching | tr/tf | 90 | 110 |
VCRS | Output signal crossover | 1.3 | 2 | |
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After the Touch Sensor Module is powered on, it will act as a slave device on a I2C bus. For further information about what commands could be send or receive through this interface, please refer to .I2C Transport v2.3.
I2C Characteristics
The I2C interface meets the requirements of the standard I2C communication protocol with the following restrictions: SDA and SCL are mapped to I/O pins that are not “true” open-drain. When configured as open-drain, the PMOS connected between the I/O pin and VDD is disabled, but is still present.
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