Telit Wireless Solutions BLUEMOD+S42/AI/ADC/LUA, Руководство пользователя

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S42
Hardware User Guide
1VV0301303 Rev. 11
Page 23 of 85 2021-05-06
Not Subject to NDA
3.3.4. Baud Rate Deviation
The following table shows the deviation in percent of the standard data rates. The
deviation may be caused by the inaccuracy of the crystal oscillator or granularity of the
baud rate generator.
Baud Rate nominal Baud Rate actual Deviation [%]
1200 1205 +0,42
2400 2396 -0,17
4800 4808 +0,17
9600 9598 -0,02
14400 14401 0,01
19200 19208 0,04
28800 28777 -0,08
38400 38369 -0,08
57600 57554 -0,08
76800 76923 0,16
115200 115108 -0,08
230400 231884 0,64
250000 250000 0,00
460800 457143 -0,79
921600 921176 -0,05
1000000 1000000 0,00
Table 5: Deviation of Baud rates
Note/Tip: The total deviation of sender and receiver shall not exceed
2,5% to prevent loss of data.
Note/Tip: Baud rates <9600bps are not supported while UICP is
enabled.
3.3.5. Dynamic I/O Signal Type Changes Depending on UICP Status
In order to allow customers to use the serial interface with the minimal signal count on
the one side and to reduce current consumption when using UICP on the other side, the
S42 FW supports the following dynamic I/O signal type changes depending on
the UICP activated resp. deactivated status.
Signal UICP deactivated UICP activated
UART-CTS# I-PD I-FLOAT
IUR-IN# I-DIS I-FLOAT
IUR-OUT# I-DIS O-PP
Legend: I-PD = Input with pull-down resistor, I-DIS = Input disconnected,
I-FLOAT = input floating, O-PP = Output push-pull
Signal types I-PD, I-DIS, and O-PP may be left open. I-FLOAT must be driven to GND or
VCC to avoid open CMOS input oscillation.