0
ACTIVE
Local sensor accuracy (max) |
1 |
Type |
Remote |
Operating temperature range (°C) |
0 to 125 |
Supply voltage (min) (V) |
3 |
Interface type |
I2C, SMBus |
Supply voltage (max) (V) |
3.6 |
Features |
ALERT |
Supply current (max) (µA) |
1000 |
Temp resolution (max) (bps) |
8 |
Remote channels (#) |
1 |
Addresses |
9 |
Rating |
Catalog |
SSOP (DBQ)-16-29.4 mm² 4.9 x 6
| Supply Voltage | 3.0V - 3.6V |
| Supply Current | 1 mA (max) |
| Local Temperature Accuracy | ±1.0°C (typ) |
| Remote Diode Temperature Accuracy | |
| +60°C to +100°C | ±3°C (max) |
| 0°C to +125°C | ±5°C (max) |
The LM84 is a remote diode temperature sensor, Delta-Sigma analog-to-digital converter, and digital over-temperature detector with an SMBus interface. The LM84 senses its own temperature as well as the temperature of a target IC with a diode junction, such as a Pentium® II processor or a diode connected 2N3904. A diode junction (semiconductor junction) is required on the target IC's die. A host can query the LM84 at any time to read the temperature of this diode as well as the temperature state of the LM84 itself. A T_CRIT_A# interrupt output becomes active when the temperature is greater than a programmable comparator limit, T_CRIT.
The host can program as well as read back the state of the T_CRIT register. Three state logic inputs allow two pins (ADD0, ADD1) to select up to 9 SMBus address locations for the LM84. The sensor powers up with default thresholds of 127°C for T_CRIT.
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