Hi,
I want to develop a 125KHz transmitter with TPIC84000-Q1. The main goal of such transmitter is to transmit CONTINUOUS data information.
As long as I have been reading from the datasheet, there are two buffers of 56 bits where information can be stored and transmitted afterwards. Therefore, in order to test the device, I have built a design based on the typical application circuit. Once I checked the circuit is correctly implemented, and is able to transmit the information stored in buffer 1, I tried to make it transmit continuously.
I have tried to achieve it repeating at least twice a couple of sequence of commands.
1 - Configuring the Configuration register with the Selection of sending mode at 0 (wait for trigger command via SPI), write buffer 1, and then transmit. Therefore, the sequence of commands is as follows:
- 10e8000528000020
- 3011001100110011
- D000000000000000
2 - Configuring the Configuration register with the Selection of sending mode at 1 (start transmission as soon as buffer 1 has received the full 56 bits), and then writting buffer1. Therefore, the sequence of commands is as follows:
- 10e8000528000022
- (Buffer2 can be configured here, and transmitted next to buffer1)
- 3011001100110011
In this case, repeating twice this sequence, I achieved the minimum time between transmissions at 20ms (please, find image attached). However it's crucial for us to transmit continuously.
Taking into account the fact that I have tried also writing buffer2, but I did not achieve to reduce such interval between two transmissions with the purpose of transmitting continuously, I have several questions:
1 - Is the TPIC84000-Q1 able to transmit continuously?
2 - Is there any configuration of registers able to make this continuous transmission (similar as when buffer1 and buffer2 are sent) feasable? I mean sending buffer1, buffer2, buffer1, buffer2, with no time interval between transmissions.
3 - I am using a USB-SPI converter to communicate a software (which sends the commands) with the TPIC. Can that be the reason of the delay between buffer transmissions?
4 - Which is the minimum delay between the process of transmission (write the buffer and transmit) possible with this TPIC84000-Q1?
Thank you so much in advance,
Gerardo