User's Manual

USER MANUA

V0.82

TCM 300 / 300C / 320 / 320C

Max. output current:

2 mA @ IOVDD=3.3 V

0.65 mA @ IOVDD=1.8 V

Programming I/F

WXIDIO Not used Digital output, internally set to LOW

WXODIO Not used Digital output, internally set to LOW

RF_WHIP RF output Output for whip antenna

RF_50 RF output 50 Ohm output for external antenna

n.c. Not connected Do not connect!

2 .2 .1 I nterface supply volt a ge - I OVDD

For digital communication with other circuitry (peripherals) the digital I/O configured pins

of the mixed signal sensor interface (ADIO0 to ADIO7) and the pins of the serial interface

(SCSEDIO0, SCLKDIO1, WSDADIO2, RSDADIO3) may be operated from supply voltages

different from DVDD. Therefore an interface voltage supply pin IOVDD is available which

can be connected either to DVDD or to an external supply within the tolerated voltage

range of IOVDD.

If DVDD=0 V (e.g. in any sleepmode) and IOVDD is supplied, there may be un-

predictable and varying current from IOVDD caused by internal floating nodes. It

must be taken care that the current into IOVDD does not exceed 10 mA while

DVDD=0.

If DVDD=0 V and IOVDD is not supplied, do not apply voltage to any above men-

tioned pin. This may lead to unpredictable malfunction of the device.

In TCM 320/TCM 320C VDD is internally connected to IOVDD! Therefore the above

mentioned issues have to be considered when writing own firmware based on API.

IOVDD voltage must not exceed VDD voltage! A malfunction of the module may be

caused by such inverse supply!

For I/O pins configured as analog pins the IOVDD voltage level is not relevant!