JAJSMU1 February 2023 DS90UB638-Q1
PRODUCTION DATA
The primary device address is set through a resistor divider (RHIGH and RLOW — see Serial Control Bus Connection below) connected to the IDX pin. Note that the voltage of VI2C must match the voltage of VVDDIO. The DS90UB638-Q1 waits 1 ms after PDB goes high to allow time for power supply transients before the IDX value is sampled and the device is configured to set the I2C address. The primary I2C target address is stored in the I2C Device ID register at address 0x0. In addition to the primary I2C target address, the DS90UB638-Q1 may be programmed to respond to up to 2 other I2C addresses. The two RX Port ID addresses provide direct access to the Receive Port 0 registers, which means the user does not need to set the paging controls normally required to access the port registers. The I2C_RX0_ID register is located in register address 0xF8.
The IDX pin configures the control interface to one of eight possible device addresses. A pullup resistor and a pulldown resistor may be used to set the appropriate voltage ratio between the IDX input pin (VIDX) and V(VDD18), each ratio corresponding to a specific device address. See Serial Control Bus Addresses for IDX for more information.
NO. | VIDX VOLTAGE RANGE | VIDX TARGET VOLTAGE | SUGGESTED STRAP RESISTORS (1% TOL) | PRIMARY ASSIGNED I2C ADDRESS | ||||
---|---|---|---|---|---|---|---|---|
VMIN | VTYP | VMAX | (V); VDD1P8 = 1.8 V | RHIGH ( kΩ ) | RLOW ( kΩ ) | 7-BIT | 8-BIT | |
0 | 0 | 0 | 0.131 × V(VDD18) | 0 | OPEN | 10.0 | 0x30 | 0x60 |
1 | 0.179 × V(VDD18) | 0.213 × V(VDD18) | 0.247 × V(VDD18) | 0.374 | 88.7 | 23.2 | 0x32 | 0x64 |
2 | 0.296 × V(VDD18) | 0.330 × V(VDD18) | 0.362 × V(VDD18) | 0.582 | 75.0 | 35.7 | 0x34 | 0x68 |
3 | 0.412 × V(VDD18) | 0.443 × V(VDD18) | 0.474 × V(VDD18) | 0.792 | 71.5 | 56.2 | 0x36 | 0x6C |
4 | 0.525 × V(VDD18) | 0.559 × V(VDD18) | 0.592 × V(VDD18) | 0.995 | 78.7 | 97.6 | 0x38 | 0x70 |
5 | 0.642 × V(VDD18) | 0.673 × V(VDD18) | 0.704 × V(VDD18) | 1.202 | 39.2 | 78.7 | 0x3A | 0x74 |
6 | 0.761 × V(VDD18) | 0.792 × V(VDD18) | 0.823 × V(VDD18) | 1.420 | 25.5 | 95.3 | 0x3C | 0x78 |
7 | 0.876 × V(VDD18) | V(VDD18) | V(VDD18) | 1.8 | 10.0 | OPEN | 0x3D | 0x7A |