Part Number: TPL1401 Tool/software: Good afternoon, I'm having trouble initializing TPL1401 digital potentiometer, specifically trying to write GENERAL_CONFIG register and DPOT_POSITION register. Let me add some more context. Like in my previous post I'm using e2_studio programming IDE, and I'm using synergy S7G2 micrcontroller, e2_studio provides low-layer drivers that controls in the background I2C addressing + R/W! bit, meaning you specify a 7 bit device address and then, depending on which method user uses (write/read), R/W! bit is set to 1 or 0 : Reading TPL1401 datasheet, Address Byte is 8 bit long, AD6 AD5 AD4 AD3 AD2 AD1 AD0 R/!W, acording to datasheet first 4 bits are fixed (1001), following 3 bits depend on A0 pin, since I'm controlling 16 TPL1401 I have all possibilities: 000 001 010 011 Lastly, as mentioned before R/W! which is controlled using I2C low-layer methods. Knowing I have to set an Slave Address, all possible combinations are the following: 0x48 (1001 000) 7 bit long 0x49(1001 001) 7 bit long 0x4A(1001 010) 7 bit long 0x4B(1001 011) 7 bit long If I want to perform I2C Update Sequence I need to send Address Byte + Command Byte + MSDB + LSDB (32bits), e2_studio manages first 8 bits in the background, so me as user i only have to send 24 bits. If I want to perform I2C Read Sequence I need to send Address Byte + Command Byte(write request), then send a read request and store whatever TPL1401 returns. Now, I could validate reading TPL1401 STATUS register and GENERAL_CONFIG register. When I try to read mentioned devices I get the following: STATUS : 0000 0000 0001 0100 --> 0x14 which matches device_id[5:2] value GENERAL_CONFIG: 0000 0001 1111 0000 -> which matches default configuration, DPOT_PDN[4:3] field is initialized to 10 (Power down to high impedance) I assumed because of this I'm not able to write/read DPOT_POSITION register, so the logic thing would be to set DPOT_PDN[4:3] to 00: Power Up, problem is when I try to write this register it doesn't seem to be able to set desired value. GENERAL_CONFIG is 16 bit long, so I assumed the correct register configuration would be 0000 0001 1110 0000, this can be placed inside a uint8_t array of two positions, for example //TEST data = 0xE0 ; uint8_t i2c_data [ 2 ] = { 0x01 , data }; // MSB = 0x00, LSB = data When I call my i2c method it seems to be performed correctly, but when I try to read the register it is still the same as the beginning, no changes are applied, so I'm wondering what I could be missing, I can provide the whole code if necessary. In resum, my write petition is 24 bit long, Command Byte + MSB + LSB, but when reading same register value stays unchanged. Greetings,
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