we are using TDA8029 in one of our application board. Just a summary of the circuit.
TDA8029 in our board connects a USIM card and reads the data and sends on UART.
In our board, 2 supply inputs of TDA8029 VDD, VDCIN are connected to 3.3V and we have support for 3V and 5V cards.
We need to find the TDA8029 current consumption for below 2 cases
- VDD=VDCIN=3.3V and 3V card
- VDD=VDCIN=3.3V and 5V card
Below picture shows current consumption for other cases.
There is no support from manufacturer currently. How to interpolate/approximate the current for the above 2 cases.
One more thing, as Card power is driven from controller after detecting the card, for table shared above in picture.
for VDD=2.7V 5V card Idd = 250mA but card current is 65mA --> Actual TDA8029 current consumption is 250-65= 185mA
For VDD=2.7, 3V card TDA8029 alone current 125-50 = 75mA (excluding card current)
For VDD=5V, 3V card TDA8029 alone current 65-50 = 15mA
All these 3 situations are giving 3 different values of current consumption for TDA8029, which i couldn't able to interpret correctly. What could be wrong. please help.
There are similar controllers from other manufacturers with 80C51 core like SEC1120/SEC1100 or 73S1209F - These controllers have very less current consumption in 10-30mA.
Is there any issue with datasheet or my interpretation.?