MCP3422 Microchip Technology Inc., MCP3422 Datasheet
MCP3422
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MCP3422 Summary of contents
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... The user can select the PGA gain of x1, x2, x4 before the analog-to-digital conversion takes place. This allows the MCP3422/3/4 devices to convert a very weak input signal with high resolution. The MCP3422/3/4 devices have two conversion modes: (a) One-Shot Conversion mode and (b) Contin- uous Conversion mode ...
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... Includes Exposed Thermal Pad (EP); see Functional Block Diagram MCP3422 CH1+ CH1- CH2+ Gain = 1,2, CH2- DS22088B-page 2 The MCP3422 is available in 8-pin SOIC, DFN, and MSOP packages. The MCP3423 is available in 10-pin DFN, and MSOP packages. The MCP3424 is available in 14-pin SOIC and TSSOP packages MSOP CH1+ CH1+ ...
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... Voltage Reference (2.048V) V REF ΔΣ ADC PGA Converter Interface Clock Oscillator MCP3424 Voltage Reference (2.048V) V REF ΔΣ ADC PGA Converter Interface Clock Oscillator MCP3422/3/4 Adr1 Adr0 SCL SDA Adr1 Adr0 SCL SDA DS22088B-page 3 ...
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... MCP3422/3/4 NOTES: DS22088B-page 4 © 2008 Microchip Technology Inc. ...
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... SPS — 1.5 — µV ppm of — FSR — 2.048 — — 0.05 0.35 . REF MCP3422/3 +5.0V 0V Conditions [CHn+ - CHn (Note 1) During normal mode operation (Note 2) PGA = 240 SPS SPS SPS DR = 3.75 SPS 12 bits mode 14 bits mode ...
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... MCP3422/3/4 ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise specified, all parameters apply for T CHn+ = CHn / /2. All ppm units use 2*V REF INCOM REF Parameters Sym PGA Gain Error Match (Note 6) Gain Error Drift (Note 6) Offset Error V OS Offset Drift vs. Temperature Common-Mode Rejection Gain vs ...
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... A θ — 84.5 — °C/W JA θ — 211 — °C/W JA θ — 149.5 — °C/W JA θ — 57 — °C/W JA θ — 202 — °C/W JA θ — 120 — °C/W JA θ — 100 — °C/W JA MCP3422/3/4 = +5.0V 0V. SS Conditions DS22088B-page 7 ...
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... MCP3422/3/4 NOTES: DS22088B-page 8 © 2008 Microchip Technology Inc. ...
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... FIGURE 2-4: Voltage. 2 PGA = 1 1.5 PGA = 8 1 0.5 0 PGA = 4 -0.5 -1 -1.5 -2 -100 -75 FIGURE 2-5: 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 PGA = 1 -0.6 -60 -40 -20 FIGURE 2-6: MCP3422/3/4 /2, REF T = +25°C A PGA = 1 PGA = 8 PGA = 4 PGA = 2 -50 - 100 Input Signal (% of FSR) Output Noise vs. Input T = +25°C A PGA = 2 -50 - 100 Input Voltage (% of Full-Scale) Total Error vs ...
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... MCP3422/3/4 Note: Unless otherwise indicated -40°C to +85° /2. INCOM REF 200 180 V = 5.5V DD 160 140 120 V DD 100 -60 -40 - 100 120 140 Temperature (°C) FIGURE 2-7: I vs. Temperature. DDA 1 0.9 0 5.5V 0.7 DD 0.6 0 5.0V 0.4 DD 0.3 0.2 0.1 0 -60 -40 - ...
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... If an analog ground path is available in the application PCB (printed circuit board highly recommended that and the V pin be tied to the analog ground path or SS isolated within an analog ground plane of the circuit board. MCP3422/3/4 Function 2 C Interface 2 C Interface . ...
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... MCP3422/3/4 CHn PIN EGEND V = Signal Source R = Source Impedance ss CHn = Analog Input Pin C = Input Pin Capacitance PIN V = Threshold Voltage T FIGURE 3-1: Equivalent Analog Input Circuit. 3.3 Serial Clock Pin (SCL) 2 SCL is the serial clock pin of the I C interface. The device act only as a slave and the SCL pin accepts only external serial clocks ...
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... DESCRIPTION OF DEVICE OPERATION 4.1 General Overview The MCP3422/3/4 devices are differential multi-chan- nel low-power, 18-Bit Delta-Sigma A/D converters with serial interface. The devices contain an input channel selection multiplexer (mux), a programmable gain amplifier (PGA), an on-board voltage reference (2.048V), and an internal oscillator. When the device powers up (POR is set), it automati- cally resets the configuration bits to default settings ...
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... MCP3422/3/4 4.5 Input Voltage Range The differential (V ) and common mode voltage the input pins without considering PGA INCOM setting are defined by CHn+ – CHn CHn+ + CHn ---------------------------------------------- - INCOM 2 Where nth input channel (n= The input signal levels are amplified by the internal programmable gain amplifier (PGA) at the front end of the Δ ...
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... TABLE 4-3: – 2.048V Resolution Data Rate Setting Note: Maximum n-bit code = 2 Minimum n-bit code = - MCP3422/3/4 RESOLUTION SETTINGS VS. LSB LSB 1 mV 250 µV 62.5 µV 15.625 µV FOR 18 BITS (NOTE 1, NOTE 2) Digital Output Code 011111111111111111 011111111111111111 000000000000000010 000000000000000001 000000000000000000 ...
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... MCP3422/3/4 4.9.2 CONVERTING THE DEVICE OUTPUT CODE TO INPUT SIGNAL VOLTAGE When the user gets the digital output codes from the device as described in Section 4.9.1 “Digital output code from device”, the next step is converting the digital output codes to a measured input voltage. Equation 4-4 shows an example of converting the output codes to its corresponding input voltage ...
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... One-Shot Conversion mode, the device draws only about one fourth of its total operating current. In this example, the device consumes approx- imately 36 µA (135 µA / 3.75 SPS = 36 µA), if the device performs only one conversion per second (1 SPS) in 18-bit conversion mode with 3V power supply. MCP3422/3 DS22088B-page 17 ...
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... Select Channel Select Channel 3 (MCP3424 only, treated as “00” by the MCP3422/MCP3423 Select Channel 4 (MCP3424 only, treated as “01” by the MCP3422/MCP3423) bit 4 O/C: Conversion Mode Bit 1 = Continuous Conversion Mode (Default). The device performs data conversions continuously One-Shot Conversion Mode. The device performs a single conversion and enters a low power standby mode until it receives another write or read command ...
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... R/W bit. Figure 5-1 shows the address byte. Figure 5-5 show how to write the configuration register bits and read the conversion results. MCP3422/3 (Inter-Integrated Circuit) inter bus char Bus Char- shows the details of the address ...
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... A2 A1 MCP3423 Note 1: and MCP3424: Configured by the user. See Table 5-3 for address bit configurations. 2: MCP3422: Programmed at the factory during production. FIGURE 5-1: Address Byte. 5.3.2 DEVICE ADDRESS BITS (A2, A1, A0) AND ADDRESS SELECTION PINS ( AND MCP3423 MCP3424 The MCP3423 and MCP3424 have two external device address pins (Adr1, Adr0) ...
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... Master 1st Byte: Address Byte with Write command Note: – Stop bit can be issued any time during writing. – MCP3422/3/4 device code is 1101 (programmed at the factory). – See Figure 5-1 for details in Address Byte. FIGURE 5-3: Timing Diagram For Writing To The MCP3422/3/4. © 2008 Microchip Technology Inc. ...
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... MCP3422/3/4 5.3.4 READING OUTPUT CODES AND CONFIGURATION BYTE FROM THE DEVICE When the Master sends a read command (R/W = 1), the device outputs both the conversion data and config- uration bytes. Each byte consists of 8 bits with one acknowledge (ACK) bit. The ACK bit after the address byte is issued by the device and the ACK bits after each conversion data bytes are issued by the Master ...
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... FIGURE 5-4: Timing Diagram For Reading From The MCP3422/3/4 With 18-Bit Mode. © 2008 Microchip Technology Inc. MCP3422/3/4 DS22088B-page 23 ...
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... MCP3422/3/4 FIGURE 5-5: Timing Diagram For Reading From The MCP3422/3/4 With 12-Bit to 16-Bit Modes. DS22088B-page 24 © 2008 Microchip Technology Inc. ...
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... High-Speed (HS) mode Master. This byte is referred to as the High-Speed (HS) Master 2 C Mode Code (HSMMC). The MCP3422/3/4 devices do not acknowledge this byte. However, upon receiving this code, the device switches on its HS mode filters and communicates up to 3.4 MHz on SDA and SCL bus lines ...
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... Acknowledge (NAK)) on the the slave last byte. In this case, the MCP3422/3/4 devices release the SDA line to allow the Master (microcontrol- ler) to generate a STOP or repeated START condition. The non-acknowledgement (NAK) is issued by provid- ing the SDA line to “ ...
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... C specification. This specification is equivalent to the Data Hold Time ( = HD:DAT can be affected. LOW ) or Clock Low time (T SU:DAT MCP3422/3/4 = +2.7V to +5.0V, DD Units Conditions kHz From (Note From (Note After this period, the first clock pulse is generated ...
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... MCP3422/3/4 2 TABLE 5- SERIAL TIMING SPECIFICATIONS (CONTINUED) Electrical Specifications: Unless otherwise specified, all limits are specified for 0V, CHn+ = CHn /2. SS REF Parameters Sym High Speed Mode (3.4 MHz) Clock frequency f SCL Clock high time T HIGH Clock low time T LOW SCL rise time ...
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... SCL SU:STA T LOW T SDA HD:STA FIGURE 5- Bus Timing Data. © 2008 Microchip Technology Inc. T HIGH T SU:DAT T HD:DAT T AA MCP3422/3 SU:STO T BUF 0.7V DD 0.3V DD DS22088B-page 29 ...
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... MCP3422/3/4 NOTES: DS22088B-page 30 © 2008 Microchip Technology Inc. ...
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... CONNECTING BUS USING PULL-UP RESISTORS The SCL and SDA pins of the MCP3422/3/4 are open-drain configurations. These pins require a pull-up resistor as shown in Figure 6-1. The value of these pull-up resistors depends on the operating speed (stan- dard, fast, and high speed) and loading capacitance of ...
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... MCP3422/3/4 6.1.4 DEVICE CONNECTION TEST The user can test the presence of the MCP3422/3 the I C bus line without performing an input data con- version. This test can be achieved by checking an acknowledge response from the MCP3422/3/4 after sending a read or write command. Here is an example ...
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... Application Examples The MCP3422/3/4 devices can be used for broad ranges of sensor and data acquisition applications. Figure 6-5 shows a circuit example measuring both the battery voltage and current using the MCP3422 device. Channels 1 and 2 are measuring the voltage and the current, respectively. When the input voltage is greater than the internal ref- erence voltage ( ...
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... Equation 6-1 shows the measurement bud- get for sensor signal using the MCP3422/3/4 device with 18 bits and PGA = 8 settings. With this configura- tion, the MCP3424 can detect the input signal level as low as approximately 2 µV. The internal PGA boosts the input signal level eight times. The 40 µ ...
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... R 2 × ------------------ and R = Voltage Divider 1 2 age). Equation 6-3 the number of output code for the full scale output of the NPP301. MCP3422/3 Pressure Sensor (NPP301 Thermistor 2 T MCU O (MASTER shows an example of calculating DS22088B-page 35 ...
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... MCP3422/3/4 EQUATION 6-3: EXPECTED NUMBER OF OUTPUT CODE FOR NPP301 PRESSURE SENSOR ⎛ Expected ⎜ ----------------------- - log Number of Output Code = ⎜ 2 15.625μV ⎝ ----------------------- - = 12.64 bits for PGA = 1 = 13.64 bits for PGA = 2 = 14.64 bits for PGA = 4 = 15.64 bits for PGA = 8 Where: 1 LSB = 15.625 µV with 18 Bit configuration. The thermistor temperature sensor can measure the temperature range from -100° ...
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... DEVELOPMENT TOOL SUPPORT 7.1 MCP3422/3/4 Evaluation Boards The Evaluation Boards for MCP3422/3/4 devices are available from Microchip Technology Inc. The boards work with Microchip’s PICkit™ Serial Analyzer. The user can simply connect any sensing voltage to the input test pads of the board and read conversion codes using the easy-to-use PICkit™ ...
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... MCP3422/3/4 NOTES: DS22088B-page 38 © 2008 Microchip Technology Inc. ...
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... PACKAGING INFORMATION 8.1 Package Marking Information 8-Lead DFN (2x3) (MCP3422) XXX YWW NN 8-Lead MSOP (MCP3422) XXXXXX YWWNNN 8-Lead SOIC (300 mil) (MCP3422) XXXXXXXX XXXXXNNN YYWW 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’) ...
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... MCP3422/3/4 Package Marking Information (Continued) 10-Lead DFN (3x3) (MCP3423 XXXX 2 9 XYWW 3 8 NNN 10-Lead MSOP (MCP3423) XXXXXX YWWNNN 14-Lead SOIC (150 mil) (MCP3424) XXXXXXXXXXX XXXXXXXXXXX YYWWNNN 14-Lead TSSOP (4.4 mm) (MCP3424) XXXXXXXX YYWW NNN DS22088B-page 40 Example 3423 2 9 0835 ...
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... D N NOTE TOP VIEW A3 © 2008 Microchip Technology Inc EXPOSED PAD BOTTOM VIEW A NOTE 2 A1 MCP3422/3 NOTE DS22088B-page 41 ...
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... MCP3422/3/4 DS22088B-page 42 © 2008 Microchip Technology Inc. ...
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... D N NOTE © 2008 Microchip Technology Inc MCP3422/3/4 φ L DS22088B-page 43 ...
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... MCP3422/3/4 N NOTE DS22088B-page φ α c β © 2008 Microchip Technology Inc. ...
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... Microchip Technology Inc. MCP3422/3/4 DS22088B-page 45 ...
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... MCP3422/3 NOTE TOP VIEW A3 DS22088B-page EXPOSED PAD BOTTOM VIEW A A1 NOTE NOTE © 2008 Microchip Technology Inc. ...
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... Microchip Technology Inc. MCP3422/3/4 DS22088B-page 47 ...
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... MCP3422/3 NOTE DS22088B-page φ © 2008 Microchip Technology Inc. ...
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... N NOTE © 2008 Microchip Technology Inc φ MCP3422/3/4 h α c β DS22088B-page 49 ...
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... MCP3422/3 NOTE DS22088B-page © 2008 Microchip Technology Inc. φ L ...
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... Added new package marking information and package outline drawings for MCP3422 and MCP3423 devices. 3. Added MCP3422 and MCP3423 devices to Product Identification System page. Revision A (June 2008) • Original Release of this Document. © 2008 Microchip Technology Inc. MCP3422/3/4 ...
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... MCP3422/3/4 NOTES: DS22088B-page 52 © 2008 Microchip Technology Inc. ...
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... Default option. Contact Microchip factory for other address options. © 2008 Microchip Technology Inc. Examples: X /XX Package MCP3422 a) MCP3422A0-E/MC: 2-Channel ADC, b) MCP3422A0T-E/MC: Tape and Reel, c) MCP3422A0-E/MS: 2-Channel ADC, d) MCP3422A0T-E/MS: Tape and Reel, e) MCP3422A0-E/SN: 2-Channel ADC, f) MCP3422A0T-E/SN: Tape and Reel, MCP3423 a) MCP3423-E/MF: b) MCP3423T-E/MF MCP3423-E/UN MCP3423T-E/UN: 1 ...
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... MCP3422/3/4 NOTES: DS22088B-page 54 © 2008 Microchip Technology Inc. ...
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... Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. © 2008 Microchip Technology Inc. Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, K ...
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... 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 © 2008 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris ...