I2C
There are three I2C busses on the Ten64 board:
- Primary/I2C1: Most sensors are on this bus
-
SPD/RTC/I2C3: DDR SPD and Real time clock (on a separate bus to facilitate EFI RTC implementation in the future)
On RevA this was allocated exclusively to the TPM (Trusted Platform Module), on RevB the TPM moved to I2C1.
-
Peripheral/I2C4: For SFP+ EEPROM access
Both I2C1 and I2C4 are on the GPIO header.
List of I2C1 devices¶
| I2C Address | Part | Description |
|---|---|---|
| 0x00 | (Not a device) | SMBus broadcast address |
| 0x18 | EMC1704 U19 | CPU Temperature diode + Board temperature diode |
| 0x11 | PAC1934 U41 | Add in card current + 5V voltage |
| 0x1A | PAC1934 U20 | CPU I/O rails: DDR VDD, Vpp, Vtt, 1.8V/OVDD |
| 0x29 | AT97SC3205T U23 | Trusted Platform module |
| 0x2F | EMC2301 U59 | Fan control (PWM) and tachometer |
| 0x27 | DS10DF410 U33 | Retimer for 10 Gigabit/SFP+ |
| 0x4C | EMC1813 U27 | Temperature monitor for QSGMII PHYs |
| 0x60 | MP8869 | CPU Core (1.0V) regulator |
| 0x62 | MP8869 | 3.3V Regulator |
| 0x64 | MP8869 | 5.0V Regulator |
| 0x76 | TCA9539 U39 | GPIO Expander for SFP, LTE control etc. |