The TMP421, TMP422, and TMP423 are remote temperature sensor monitors with a built-in local temperature sensor. The remote temperature sensor diode-connected transistors are typically low-cost, NPN- or PNP-type transistors or diodes that are an integral part of microcontrollers, microprocessors, or FPGAs.
Remote accuracy is ±1°C for multiple IC manufacturers, with no calibration needed. The two-wire serial interface accepts SMBus write byte, read byte, send byte, and receive byte commands to configure the device.
The TMP421, TMP422, and TMP423 include series resistance cancellation, programmable non-ideality factor, wide remote temperature measurement range (up to +150°C), and diode fault detection.
The TMP421, TMP422, and TMP423 are all available in a SOT23-8 package. The TMP421C is also available in a DSBGA (WCSP) package.
| Device Type |
| Interface |
| Local Sensor Accuracy (Max) (+/- C) |
| Temp Resolution (Max) (bits) |
| Operating Temperature Range (C) |
| Supply Voltage (Min) (V) |
| Supply Voltage (Max) (V) |
| Supply Current (Max) (uA) |
| Features |
| Remote Channels (#) |
| Addresses |
| Rating |
| Package Group |
| Package Size: mm2:W x L (PKG) |
| TMP423 | LM95234 | TMP411 | TMP421 | TMP422 | TMP451 | TMP461 | TMP468 |
|---|---|---|---|---|---|---|---|
| Remote | Remote | Remote | Remote | Remote | Remote | Remote | Remote |
|
I2C SMBus |
I2C SMBus |
I2C SMBus |
I2C SMBus |
I2C SMBus |
I2C SMBus |
I2C SMBus |
I2C SMBus |
| 2.5 | 2 | 2.5 | 2.5 | 2.5 | 1 | 1 | 0.35 |
| 12 | 11 | 12 | 12 | 12 | 12 | 12 | 13 |
| -40 to 125 | -40 to 140 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 |
| 2.7 | 2.7 | 2.7 | 2.7 | 2.7 | 1.7 | 1.7 | 1.7 |
| 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 3.6 | 3.6 | 3.6 |
| 38 | 800 | 30 | 38 | 38 | 40 | 375 | 375 |
| Shutdown |
One shot conversion control Programmable Alert Programmable conversion rate Remote diode fault detection Shutdown Thermal diode input stage filtering |
Programmable Alert Shutdown |
Shutdown | Shutdown |
Dynamic Averaging Programmable Alert Shutdown |
Programmable Alert Remote diode fault detection |
One shot conversion control Programmable Alert Programmable conversion rate Remote diode fault detection |
| 3 | 4 | 1 | 1 | 2 | 1 | 1 | 8 |
| 2 | 3 | 4 | 9 | 4 | 1 | 9 | 4 |
| Catalog | Catalog | Catalog | Catalog | Catalog | Catalog | Catalog | Catalog |
| SOT-23 | 8 | WSON | 14 |
SOIC | 8
VSSOP | 8 |
DSBGA | 8
SOT-23 | 8 |
SOT-23 | 8 | WSON | 8 | QFN | 10 |
DSBGA | 16
VQFN | 16 |
| 8SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 8) | See datasheet (WSON) |
8SOIC: 29 mm2: 6 x 4.9 (SOIC | 8)
8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8) |
See datasheet (DSBGA) 8SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 8) |
8SOT-23: 8 mm2: 2.8 x 2.9 (SOT-23 | 8) | See datasheet (WSON) | 10QFN: 4 mm2: 2 x 2 (QFN | 10) |
See datasheet (DSBGA) 16VQFN: 9 mm2: 3 x 3 (VQFN | 16) |
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