RDing TEMPer
Revision as of 15:51, 24 June 2012 by Uwe Hermann (talk | contribs)
The RDing TEMPer is a USB-based temperature logger.
See RDing TEMPer/Info for more details (such as lsusb -vvv output) about the device.
Hardware
- Main chip: Unknown, yet (markings were removed)
- Temperature sensor: Fairchild FM75 (datasheet), I2C slave addres 0x4f
- I2C EEPROM: Unknown, yet (markings were removed), I2C slave addres 0x50
- Oscillator: 6MHz
Main chip pinout:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SCL | SDA | 5V/high | 5V/high | 5V/high | 5V/high | GND | 5V/high | 3.3V | Oscillator | Oscillator | 5V/high | USB D- | USB D+ | LED (5V) | 5V | 3.3V | 3.3V |
I2C EEPROM pinout:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|
| GND | GND | GND | GND | SDA | SCL | GND | 3.3V |
See these example sigrok captures for the I2C, USB, and LED traffic going on while the device is queried from the PC.
Photos
Device, front
Device, back
Device, USB
Device, opened
PCB, front
PCB, back
Sensor, EEPROM
Random pads on the side
Main chip, microscope
Sensor, microscope
Protocol
HID-based.