MCP9805-BE/ST Microchip Technology, MCP9805-BE/ST Datasheet
MCP9805-BE/ST
Specifications of MCP9805-BE/ST
Available stocks
Related parts for MCP9805-BE/ST
MCP9805-BE/ST Summary of contents
Page 1
... Low-Power modes and the specification of tempera- ture event and critical output boundaries. When the temperature changes beyond the specified boundary limits, the MCP9805 outputs an Event signal. The user has the option of setting the Event output signal polarity as either an active-low or active-high comparator ...
Page 2
... MCP9805 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † V ....................................................................... 6.0V DD Voltage at all Input/Output pins .... GND – 0.3V to 5.5V Storage temperature ..........................-65°C to +150°C Ambient temp. with power applied .....-40°C to +125°C Junction Temperature (T )................................ +150°C J ESD protection on all pins (HBM:MM)....... (4 kV:200V) Latch-Up Current at each pin ........................ ±200 mA ...
Page 3
... Sym Min Typ Max V 2.1 — — — — 0 — — ± — — 0 — — — — — 5 — — 0.5 — HYST Voltage Current MCP9805 = -20°C to +125°C. A Units Conditions V V µ µ 3. 0. SDA OUTPUT time time DS21977B-page 3 ...
Page 4
... MCP9805 SERIAL INTERFACE TIMING CHARACTERISTICS Electrical Specifications: Unless otherwise indicated and all limits measured to 50% point. L Parameters Sym 2 2-Wire SMBus/Standard Mode I C™ Compatible Interface (Note) Serial Port Clock Frequency f Low Clock t LOW High Clock t HIGH Rise Time Fall Time Data Setup Before SCLK High ...
Page 5
... FIGURE 2-4: Temperature. 2. 3.3V to 3.6V DD 1.50 1.00 0.50 0.00 -40 -20 FIGURE 2-5: Ambient Temperature. 3 2.5 2 1.5 1 0.5 0 -40 -20 FIGURE 2-6: Voltage vs. Ambient Temperature. MCP9805 100 120 T (°C) A Supply Current vs. Ambient 100 120 T (° Shutdown Current vs 100 120 T (° ...
Page 6
... MCP9805 Note: Unless otherwise noted 3.0V to 3.6V, GND = Ground 0.4 0.3 SDA 3. 3.6V DD 0.1 Event -40 - (°C) A FIGURE 2-7: Event and SDA V Ambient Temperature. 125 V = 3.0V to 3.6V DD 110 -40 - (°C) A FIGURE 2-8: Conversion Rate vs. Ambient Temperature. 1.0 PSR , V = 3.3V + 150mV (AC) 0 ...
Page 7
... Section 5.0 “Serial Communication”). 3.5 Open-Drain Temperature Event Output pin (Event The MCP9805 Event pin is an open-drain output. The X X device outputs a signal when the ambient temperature goes beyond the user-programmed temperature limit. (see Section 4.2.3 “Event Output Configuration”). ...
Page 8
... MCP9805 4.0 FUNCTIONAL DESCRIPTION The MCP9805 temperature sensors consist of a band gap temperature sensor, a Analog-to-Digital Converter ( user-programmable registers using Configuration Register Temperature Register (T Temperature Upper-Boundary (T Temperature Lower-Boundary (T Critical Temperature Limit (T Manufacturer Identification Register Device Identification and Revision Register Device Capability Register ...
Page 9
... Temperature Upper-Boundary and Lower-Boundary Trip registers are read/writes. If the ambient tempera- ture drifts beyond the user-specified limits, the MCP9805 outputs a signal using the Event pin (refer to Section 4.2.3 “Event Output Configuration”). In addition, the Critical Temperature Trip register is used to provide an additional critical temperature limit. ...
Page 10
... CAPABILITY REGISTER This is a read-only register used to identify the temper- ature sensor capability. In this case, the MCP9805 is capable of providing temperature at 0.25°C resolution, measuring temperature below and above 0°C, providing ±1°C and ±2°C accuracy over the active and ...
Page 11
... SENSOR CONFIGURATION REGISTER (CONFIG) The MCP9805 has a 16-bit Configuration register (CONFIG) that allows the user to set various functions for a robust temperature monitoring system. Bits 10 thru 0 are used to select Event output boundary hyster- esis, device Shutdown or Low-Power mode, tempera- ture boundary ...
Page 12
... MCP9805 REGISTER 4-3: CONFIGURATION REGISTER (CONFIG) (CONTINUED) Upper-Half: U-0 U-0 U-0 — — — bit 15 Lower-Half: R/W-0 R/W-0 Crit. Lock Win. Lock bit 7 bit 6 T and T Boundary Window Lock (Win. Lock) bit: UPPER LOWER 0 = Unlocked. T and T UPPER 1 = Locked. T and T UPPER When enabled, this bit remains set ‘1’ or locked until cleared by internal reset (Section 4.3 “Summary of Power-up Default” ...
Page 13
... UPPER LOWER CRIT The MCP9805 has a 16-bit read/write Event output Temperature Upper-Boundary Trip register (T 16-bit Lower-Boundary Trip register (T 16-bit Critical Boundary Trip register (T contains 11-bit data in two’s compliment format (0.25 °C/LSb). This data represents the maximum and minimum temperature boundary or temperature window that can be used to monitor ambient tempera- ture. If this feature is enabled (Section 4.1.2 “ ...
Page 14
... MCP9805 4.1.4 AMBIENT TEMPERATURE REGISTER ( The MCP9805 uses a band gap temperature sensor circuit to output analog voltage proportional to absolute temperature. An internal ADC is used to convert the analog voltage to a digital word. The converter resolu- tion is set to 0.25 °C/LSb + sign (11-bit data). The digital ...
Page 15
... LOWER R-0 R-0 R °C/LSb 2 °C/LSb 2 °C/LSb 2 ) bits: -3 °C/LSb or 0.125°C temperature resolution Unimplemented bit, read as ‘0’ ‘0’ = bit is cleared MCP9805 ADDRESS ‘0000 0101’b R-0 R-0 R °C/LSb 2 °C/LSb 2 °C/LSb bit 8 R-0 U-0 U-0 -2 (2) °C/LSb — — bit 0 = 0° ...
Page 16
... Bit is set 4.1.6 DEVICE ID AND REVISION REGISTER The upper byte of this register is used to specify the device identification and the lower byte is used to specify device revision. The device ID for the MCP9805 is 0x00 (hex). REGISTER 4-2: DEVICE ID AND DEVICE REVISION (READ-ONLY) Upper-Half: R-0 ...
Page 17
... Event output due to an accidental rewrite to these registers. © 2005 Microchip Technology Inc. MCP9805 The Event output can also be used as a critical temper- ature output using bit 2 of CONFIG (critical output only). When this feature is selected, the Event output becomes a comparator output ...
Page 18
... MCP9805 T CRIT T UPPER LOWER Comparator Interrupt S/W Int. Clear Critical Note: 1 Event Output Boundary Note Conditions LOWER LOWER UPPER UPPER CRIT CRIT HYST * When T T and T A CRIT CONFIG (Interrupt mode) is ignored. FIGURE 4-2: Event Output Boundary Conditions. DS21977B-page UPPER HYST ...
Page 19
... Summary of Power-up Default The MCP9805 has an internal Power-on Reset (POR) circuit. If the power supply voltage threshold, the device resets the registers to the POR power-up default settings. Table 4-6 shows the power-up default summary. TABLE 4-6: POWER-UP DEFAULTS Registers Address (Hex) ...
Page 20
... Register 5-4). 5.1.4 ADDRESS BYTE Following the Start condition, the host must transmit an 8-bit address byte to the MCP9805. The address for the MCP9805 is ‘0011,A2,A1,A0’ in binary, where the A2, A1 and A0 bits are set externally by connecting the corresponding pins to V ...
Page 21
... TIME OUT SU-DATA If the SCLK stays high or low for a time specified the MCP9805 releases the bus and resets the OUT serial interface. The master will have to restart the communication cycle with a Start condition. This dictates the minimum clock speed. MCP9805 ...
Page 22
... SCLK A A SDA Address Byte S = START Condition P = STOP Condition FIGURE 5-2: Read 1-byte and 2-byte data from a Register. DS21977B-page Pointer MCP9805 MCP9805 Address Byte MCP9805 Pointer MCP9805 MSb Data Master MCP9805 Data Master LSb Data Master © 2005 Microchip Technology Inc. ...
Page 23
... Write 2-byte Data SCLK SDA Address Byte S = START Condition P = STOP Condition FIGURE 5-3: Write 1-byte and 2-byte data from a Register. © 2005 Microchip Technology Inc Pointer MCP9805 MCP9805 Pointer MCP9805 MSb Data MCP9805 MCP9805 Data MCP9805 MCP9805 LSb Data MCP9805 DS21977B-page 23 ...
Page 24
... Register Pointer. This device does not support sequential read/write START Condition P = STOP Condition FIGURE 5-4: Receive 1-byte Data from Previously Set Pointer. DS21977B-page 24 (Note Pointer MCP9805 Address Byte MCP9805 Address Byte MCP9805 MCP9805 Data Master Data Master © 2005 Microchip Technology Inc. ...
Page 25
... SDA and SCLK lines. Although SMBus specifications only require the SDA and SCLK lines to pull-down 350 µA, with a maximum voltage drop of 0.4 V, the MCP9805 is designed to meet a maximum voltage drop of 0.4 V, with current. This allows lower pull-up resistor values to be used, allowing the MCP9805 to handle higher bus capacitance ...
Page 26
... MCP9805 7.0 PACKAGING INFORMATION 7.1 Package Marking Information 8-Lead DFN (MC) XXX YWW NN 8-Lead TSSOP (ST) XXXX YYWW NNN Legend: XX...X Customer-specific information Y Year code (last digit of calendar year) YY Year code (last 2 digits of calendar year) WW Week code (week of January 1 is week ‘01’) ...
Page 27
... REF. D .079 BSC E .118 BSC D2 .051 – .069 E2 .059 – .075 L .012 .016 .020 K .008 – – b .008 .010 .012 MCP9805 MILLIMETERS* MIN NOM MAX 8 0.50 BSC 0.80 0.90 1.00 0.00 0.02 0.05 0.20 REF. 2.00 BSC 3.00 BSC 1.30** – ...
Page 28
... MCP9805 8-Lead Plastic Thin Shrink Small Outline (ST) – 4.4 mm Body (TSSOP Dimension Limits Number of Pins Pitch Overall Height Molded Package Thickness Standoff Overall Width Molded Package Width Molded Package Length Foot Length Foot Angle Lead Thickness Lead Width Mold Draft Angle Top ...
Page 29
... APPENDIX A: REVISION HISTORY Revision B (September 2005) • Added the text “for Mobile Platform Memory Module Thermal Sensor” to first bullet under Features section. Revision A (September 2005) • Original Release of this Document. © 2005 Microchip Technology Inc. MCP9805 DS21977B-page 29 ...
Page 30
... MCP9805 NOTES: DS21977B-page 30 © 2005 Microchip Technology Inc. ...
Page 31
... ST = Plastic Thin Shrink Small Outline (4x4 mm Body), 8-lead © 2005 Microchip Technology Inc. Examples: /XX a) Package b) c) MCP9805 . MCP9805T-BE/MC: Tape and Reel, Extended Temp., 8LD DFN pkg. MCP9805-BE/ST: Extended Temp., 8LD TSSOP pkg. MCP9805T-BE/ST: Tape and Reel, Extended Temp., 8LD TSSOP pkg. DS21977B-page 31 ...
Page 32
... MCP9805 NOTES: DS21977B-page 32 © 2005 Microchip Technology Inc. ...
Page 33
... PowerMate, PowerTool, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance and WiperLock are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. ...
Page 34
... Fax: 886-3-572-6459 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 © 2005 Microchip Technology Inc. EUROPE Austria - Weis Tel: 43-7242-2244-399 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris Tel: 33-1-69-53-63-20 ...