On current design we have discovered a possible problem with TCK signal on DM355. The datasheet gives conflicting characteristics for the TCK pin in two different tables. In one table (Table 2-22. Emulation Terminal Functions) the pin does not have pull-ups of pull downs. According to another table (Table 2-23. DM355 Pin Descriptions) the pin has a pull-up. Our boards do not have a JTAG connector and the JTAG pins are left unconnected as recommended by TI.
We got the DM355 EVM board and checked the TCK pin by measuring voltage to ground. The multimeter showed around 0.1V. We measured TCK pin to VCC and we got the same value. It looks looks the pin does not have a pull-up. Can anybody from TI confirm that? If that is the case do I heed to connected my external pull-up? Pull-down?
On one of our products (several years in production) we started experiencing unusually high power consumption during deep sleep mode, somewhere around 21mW vs "advertised" 3.3mW. After checking the currents for 1.3V and 1.8V supply rails (replaced EMI filters with low Omhs resistors), removing almost all peripheral I/O ICs we narrowed it down to 3.3 VCC power pins on DM355. Estimated current is about 7mA. We double-checked all I/O configurations (defined unused as outputs, match pull direction if present). Some boards work as expected. Others vary significantly pulling somewhere between 6mW and 21mW during deep sleep. The boards are from the same production batch and otherwise appear to be working.
Another set of pins in question is RSV01-RSV04. Looking at the EVM schematic, the pins appears to be differential signals. We have those pins left unconnected as mentioned in the datasheet. Is it really OK to leave those pins unconnected?