Hello,
I am using HTRC110 to read some LF transponders and I had this issue of noise on DOUT once I send READ_TAG command. So, I send this sequence of configuration commands:
SET_CONFIG_PAGE(0x72); // CONFIG_PAGE 03, clock frequency = 8 MHz, smart_comp = On, low pass = On
SET_CONFIG_PAGE(0x43); // CONFIG_PAGE 00, fL = 6KHz, fH = 160 Hz, gain0 = 16, gain1 = 31.5
SET_CONFIG_PAGE(0x50); // CONFIG_PAGE 01, coil driver active, hysteresis off, device active, idle mode
SET_CONFIG_PAGE(0x60); // CONFIG_PAGE 02, threst = 0, acqamp = 0, freeze = 00[normal operation]
ms_delay(10); // 10ms delay
smp_t = GET_PHASE(); // sends 0x08 to HTRC and read phase
smp_t << = 1;
smp_t += 0x3F; // Fixed offset compensation value
smp_t &= 0x3F;
SET_SAMPLING_TIME(0x80 | smp_t); // Send sampling time
ms_delay(10); // 10ms delay
SET_TRANSPARENT_MODE(0x03); // Send 0x03 to HTRC
I check for every page written with GET_CONFIG_PAGE and I get the values I set to the HTRC correctly. Also, for the antenna check, I get ANTFAIL = 0. But once I set the transparent mode I get this garbage on the DOUT pin:
Although I can see a meaningful output when I put a token near my antenna, that persistent garbage doesn't allow me to properly decode the signal. I need to mention that turning the hysteresis OFF and changing few parameters slightly give less noticeable garbage, but still that doesn't allow me to decode the signal properly. I am using a custom board for this LF decoding, the HTRC shares power rails with the MCU and has an 8MHz oscillator, I checked the noise on the power rails and probed the RX pin on the HTRC and all seemed good. Did anyone have this same issue with the HTRC?
