Product Overview
The MIC281 is a low-cost, small-size digital thermal sensor designed for measuring the temperature of a remote PN junction. It is compatible with commodity transistors or embedded thermal diodes found in CPUs and FPGAs. Offering 100% software and hardware backward compatibility with the MIC280, it features industry-leading noise performance and an advanced integrating A/D converter for high accuracy. Communication is facilitated via a 2-wire SMBus 2.0-compatible serial interface with 5V-tolerant I/Os. Its superior performance, low power consumption, and compact size make it ideal for cost-sensitive thermal management applications in desktop computers, servers, notebooks, set-top boxes, game consoles, and appliances.
Product Attributes
- Brand: Micrel, Inc.
- Trademark: IttyBitty
- Origin: USA
Technical Specifications
| Part Number | Marking | Slave Address | Ambient Temp. Range | Package |
| MIC281-0YM6 | TB00 | 1001 000xb | 55 to +125C | SOT23-6 |
| MIC281-1YM6 | TB01 | 1001 001xb | 55 to +125C | SOT23-6 |
| MIC281-2YM6 | TB02 | 1001 010xb | 55 to +125C | SOT23-6 |
| MIC281-3YM6 | TB03 | 1001 011xb | 55 to +125C | SOT23-6 |
| MIC281-4YM6 | TB04 | 1001 100xb | 55 to +125C | SOT23-6 |
| MIC281-5YM6 | TB05 | 1001 101xb | 55 to +125C | SOT23-6 |
| MIC281-6YM6 | TB06 | 1001 110xb | 55 to +125C | SOT23-6 |
| MIC281-7YM6 | TB07 | 1001 111xb | 55 to +125C | SOT23-6 |
| Symbol | Parameter | Condition | Min. | Typ. | Max. | Units |
| IDD | Supply Current | T1 open; CLK = DATA = High; Normal mode | 0.23 | 0.4 | | mA |
| IDD | Supply Current | Shutdown mode; T1 open; Note 7 CLK = 100kHz | | 9 | | A |
| tPOR | Power-on Reset Time, Note 7 | VDD > VPOR | | 200 | | s |
| VPOR | Power-on Reset Voltage | All registers reset to default values; A/D conversions initiated | 2.65 | 2.95 | | V |
| Accuracy | Accuracy, Notes 7, 8, 9 | 0C TD 100C, 0C < TA < 85C; 3.15V < VDD < 3.45V | 1 | 3 | | C |
| tCONV | Conversion Time | Note 7 | | 200 | 240 | ms |
| VOL | Low Output Voltage, Note 6 | IOL = 3mA | | 0.3 | | V |
| VIL | Low Input Voltage | 3V VDD 3.6V | | 0.8 | | V |
| VIH | High Input Voltage | 3V VDD 3.6V | 2.1 | 5.5 | | V |
| t1 | CLK (clock) Period | | | 2.5 | | s |
| t2 | Data In Setup Time to CLK High | | 100 | | | ns |
| t3 | Data Out Stable after CLK Low | | | 300 | | ns |
| tTO | Bus Timeout | | 25 | 30 | 35 | ms |
| Pin Number | Pin Name | Pin Function |
| 1 | VDD | Analog input: Power supply input to the IC. |
| 2 | GND | Ground return for all IC functions. |
| 3 | T1 | Analog input: Connection to remote diode junction. |
| 4 | CLK | Digital input: Serial bit clock input. |
| 5 | DATA | Digital input/output: Open-drain. Serial data input/output. |
| 6 | NC | No connection: Must be left unconnected. |
