We are trying to communicate with the LTC6813-1 on demo board DC2350A-B via 4-wire SPI from a 3.3V microcontroller host with 5V-compatible inputs.
After addressing /CSB for 500µs, Vreg turns on for 2 seconds. When transmitting read command RDCFGA there is no answer on MISO.
The SPI configuration is following: Speed 1MHz and mode 1,1.
Command RDCFGA: Byte0: 0x00, Byte1: 0x02, Byte2: 0x2B, Byte3: 0x0A, Byte4-11:0x00 (to get clock for 12 bytes).
The /CSB is set low before sending and set high after 12 bytes. No answer from LTC6813.
Configuration DC2350A: SDO pullup to VDD (tried 3.3 and 5V), all jumpers JP1-JP4 in 0-position, 18 cells Li-NMC connected, ISO-SPI not used.
I'm going to close this issue, since there are two identical questions posted to the forum here. The team responsible for this part has been alerted to your question and they should respond shortly.