+1.8V, Power, 16-Bit Sigma-Delta Converter 16-bit Resolution Eigh
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TC3400
+1.8V, Power, 16-Bit Sigma-Delta Converter
16-bit Resolution Eight Conversions Second, Adjustable Down 10-bit Resolution Conversions Second 1.8V 5.5V Operation, Power Operating 260µA; Sleep: 0.75µA microPortSerial Requires only Interface Lines Uses Internal External Reference Automatically Enters Sleep Mode when
Package Type
8-Pin SOIC
INREFIN
TC3400
SCLK SDAT REFOUT
Applications
Consumer Electronics, Thermostats, Monitors, Humidity Meters, Security Sensors Embedded Systems, Data Loggers, Portable Equipment Medical Instruments
INREFIN
8-Pin PDIP
TC3400
SCLK SDAT REFOUT
Device Selection Table
Part Number TC3400VPA TC3400VOA Package 8-Pin PDIP (Narrow) 8-Pin SOIC (Narrow) Temperature Range +85°C +85°C
General Description
TC3400 cost, power analog-to-digital converter based Microchip's Sigma-Delta technology. will perform 16-bit conversions (15-bit plus sign) eight second. TC3400 optimized microcontroller peripheral cost, battery operated systems. voltage reference included, external reference used. TC3400's 2-wire microPortdigital interface used starting conversions reading data. Driving SCLK line starts conversion. After conversion starts, each additional falling edge six) detected SCLK seconds reduces resolution cuts conversion time half. After conversion completed, clocking SCLK line puts through resulting data word onto SDAT line, much like shift register. part automatically sleeps when performing data conversion. TC3400 available 8-Pin PDIP 8-Pin SOIC package.
2002 Microchip Technology Inc.
DS21409B-page
TC3400
Typical Application
VBATT
IN1+ IN1-
SDAT SCLK I/01 I/02 Controller
TC3400
REFIN REFOUT 0.1µF
Functional Block Diagram
REFOUT
TC3400
1.193V
REFIN
CONV Done
Modulator
Data Shift Reg.
SDAT
CONVCLK
Clock Generator Control Circuitry
CLKOUT
SCLK
DS21409B-page
2002 Microchip Technology Inc.
TC3400
ELECTRICAL CHARACTERISTICS
*Stresses above those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only functional operation device these other conditions above those indicated operation sections specifications implied. Exposure Absolute Maximum Rating conditions extended periods affect device reliability.
Absolute Maximum Ratings*
Supply Voltage 6.0V Input Voltage (All Other Pins): (GND 0.3V) (VDD 0.3V) Operating Temperature Range 85°C Storage Temperature -65°C +150°C
TC3400 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: 25°C 2.7V, unless otherwise specified. Boldface type specifications apply temperatures 85°C. VREF 1.25V, Internal Clock Frequency 520kHz. Symbol Power Supply SLEEP Supply Voltage Supply Current, During Data Conversion Supply Current, Sleep Mode Accuracy (Differential Inputs) VNOISE PSRR IN+, INVIN Differential Input Voltage Absolute Voltage Range IN+, INInput Bias Current Input Sampling Capacitance Differential Input Resistance Note Note Resolution Integral Non-Linearity Offset Error Referred input Common Mode Rejection Full Scale Error Power Supply Rejection Ratio .0038 0.4% ±0.9 Bits %FSR %FSR 2.7V IN+, 2.5V 3.5V 0.75 Parameter Unit Test Conditions
+25°C
µVrms
REFIN, REFOUT VREF IREF VREFOUT REFSINK REFSRC REFIN Voltage Range REFIN Input Current REFOUT Voltage REFOUT Current Sink Capability REFOUT Current Source Capability 1.193 1.25
Note Differential input voltage defined (VIN+ Resistance from INn+ INn- GND. 1.8V, ISOURCE 200µA.
2002 Microchip Technology Inc.
DS21409B-page
TC3400
TC3400 ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: 25°C 2.7V, unless otherwise specified. Boldface type specifications apply temperatures 85°C. VREF 1.25V, Internal Clock Frequency 520kHz. Symbol SCLK ILEAK SDAT Output Voltage Output High Voltage (SDAT) 1.5mA ISOURCE 400µA (Note Input Voltage Input High Voltage Leakage Current Parameter Unit Test Conditions
Note Differential input voltage defined (VIN+ Resistance from INn+ INn- GND. 1.8V, ISOURCE 200µA.
TC3400 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: 25°C 2.7V, unless otherwise specified. Boldface type specifications apply temperatures 85°C. VREF 1.25V, Internal Clock Frequency 520kHz. Symbol Parameter Resolution Reduction Clock Width Resolution Reduction Clock Width Conversion Time (15-bit Plus Sign) Conversion Time (14-bit Plus Sign) Conversion Time (13-bit Plus Sign) Conversion Time (12-bit Plus Sign) Conversion Time (11-bit Plus Sign) Conversion Time (10-bit Plus Sign) Conversion Time (9-bit Plus Sign) Resolution Reduction Window SCLK Data Valid Acknowledge Delay 1000 t3/2.0 t3/4.0 t3/7.8 t3/15.1 t3/28.6 t3/51.4 t3/85.7 1000 Unit µsec µsec msec msec msec msec msec msec msec msec nsec nsec Test Conditions Width SCLK (Negative) Width SCLK (Positive) 16-bit Conversion, 25°C (Note 15-bit Conversion 14-bit Conversion 13-bit Conversion 12-bit Conversion 11-bit Conversion 10-bit Conversion Width SCLK SCLK Falling Edge SDAT Valid SCLK SDAT Delay
Note Nominal temperature drift -2830ppm/C° temperature less than 25°C -1340ppm/°C temperatures greater than 25°C.
DS21409B-page
2002 Microchip Technology Inc.
TC3400
DESCRIPTIONS
descriptions pins listed Table 2-1.
TABLE 2-1:
(8-Pin SOIC) (8-Pin PDIP)
FUNCTION TABLE
Symbol INREFIN Description Analog Input. This positive terminal true differential input consisting IN-. VIN1 (IN+ IN-). Section Electrical Characteristics. Analog Input. This negative terminal true differential input consisting IN-. (IN+ IN-) swing below, ground. Analog Input. converter's reference voltage differential between this ground times two. tied directly REFOUT scaled using resistor divider. user supplied reference voltage less than 1.25V used place REFOUT. Ground Terminal. Analog Output. internal reference connects this pin. scaled externally, desired, tied REFIN input provide converter's reference voltage. Care must taken connecting external circuitry this pin. Digital Output (push-pull). This microPortserial data output. SDAT driven while TC3400 converting data, effectively providing "busy" signal. After conversion complete, every high transition SCLK puts from resulting data word SDAT (from LSB). Digital Input. This microPortserial clock input. TC3400 comes sleep mode conversion cycle begins when this driven low. After conversion starts, each additional falling edge six) detected SCLK seconds reduces resolution bit. When conversion complete, data word shifted SDAT clocking SCLK pin. Power Supply Input.
REFOUT
SDAT
SCLK
2002 Microchip Technology Inc.
DS21409B-page
TC3400
DETAILED DESCRIPTION
TABLE 3-1:
TC3400 16-bit sigma-delta converter with differential input. Typical Application circuit Functional Block diagram. components TC3400 described below. Also refer Figure 3-4, Operational Flowchart Timing Diagrams, Figure 3-1, Figure Figure 3-3).
DATA CONVERSION WORD VOLTAGE INPUT (REFIN 1.193V)
INn+ INn- (Volts) 2.38596 (Positive Full Scale) 72.8 -72.8 -2.38596 (Negative Full Scale) Reserved Code
Data Word 0111 1111 1111 1111 0000 0000 0000 0001 0000 0000 0000 0000 1111 1111 1111 1111 1000 0000 0000 0001 1000 0000 0000 0000
Converter Operation
When TC3400 converting, sleep mode with both SCLK SDAT lines high. conversion initiated high transition SCLK line which time internal clock TC3400 started. Each additional high transition SCLK (following initial SCLK falling edge) during time interval will decrement conversion resolution reduce conversion time half. time interval referred resolution reduction window. minimum conversion resolution 10-bits more than SCLK transitions during will ignored. After each high transition SCLK, interval, SDAT output driven high TC3400 acknowledge that conversion been decremented. When SCLK returns high interval ends, SDAT line returns (see Figure 3-2). When conversion complete SDAT driven high. TC3400 enters sleep mode conversion value read serial data word SDAT line.
SCLK input filter which rejects positive negative pulse width less than 50nsec reduce noise. rejection width this pulse vary between 50nsec 750nsec depending processing parameters supply voltage. Figure Table show information determining mode operation TC3400 part recording value SDAT SCLK high, then low, then high state. example, SCLK goes through 1-0-1 transition corresponding values SDAT 1-1-0, then SCLK falling edge started data conversion. 0-1-0 SDAT would have indicated resolution reduction occurred. This useful microcontroller watchdog reset otherwise loses track where TC3400 conversion data readout sequence. microcontroller simply transition SCLK until "finds" Start Conversion condition.
FIGURE 3-1:
SCLK
Reading Data Word
SCLK, SDAT LOGIC STATE DIAGRAM
After conversion complete SDAT goes high, conversion value clocked serially onto SDAT line high transitions SCLK. data word two's compliment format with sign clocked onto SDAT line, first followed ending LSB. 16-bit conversion data word would consist sign followed magnitude bits, Table shows data word versus input voltage 16-bit conversion. Note that full scale input voltage range REFIN 1LSB). When REFOUT back directly REFIN, 73µV 16-bit conversion, REFOUT typically 1.193V. Figure shows typical SCLK SDAT waveforms 10-bit conversions. Note that complete convert read cycle requires negative edge clock pulses. first convert command. Then, these occur resolution reduction window, decrement resolution. remaining pulses clock conversion data word.
SDAT
TABLE 3-2:
SCLK, SDAT LOGIC STATE
Status Start Conversion Resolution Reduction Data Transfer Data Transfer Busy*
*Note: code dual meaning: Data Transfer
Busy converting. avoid confusion, user should send only required number pulses desired resolution, then wait SDAT rise indicating conversion complete before clocking SCLK again read data bits.
DS21409B-page
2002 Microchip Technology Inc.
TC3400
FIGURE 3-2:
SCLK
CONVERSION DATA OUTPUT TIMING
SDAT
(MSB)
DN-1 DN-2 (LSB)
Sleep Mode
Data Conversion Complete Start Conversion Resolution Control Timing
Data Output Timing
FIGURE 3-3:
SCLK SDAT WAVEFORMS 10-BIT CONVERSIONS
16-bit Data Conversion, Data Word A5A5h
SCLK SDAT Data Conversion Complete 16-bit Data Conversion, Long Start Pulse, Data Word 5A5Ah SCLK SDAT Data Conversion Complete 12-bit Conversion, Data Word AB3h SCLK SDAT Data Conversion Complete 10-bit Conversion with "Extra" Data Reduction Clocks, Data Word 3A4h SCLK SDAT Data Conversion Complete
2002 Microchip Technology Inc.
DS21409B-page
TC3400
FIGURE 3-4: OPERATIONAL FLOWCHART
SDAT
CONVCLK (Conversion Done?) Sleep SDAT High
SCLK Low?
Power Down Analog, Conversion Complete, SDAT High
Power Analog, Start CONVCLK Start Conversion, Resolution 16), Latch Input Channel Address applicable).
SCLK High Low?
SCLK High transition? SDAT
SDAT m=m-1
CONVCLK
SDAT High Internal Reset
SCLK High Low? Sleep
Resolution 210? Reduce Resolution 1-bit SDAT High
DS21409B-page
2002 Microchip Technology Inc.
TC3400
PACKAGING INFORMATION
Package Marking Information
Package marking data available this time.
Taping Forms
Component Taping Orientation 8-Pin SOIC (Narrow) Devices
User Direction Feed
Standard Reel Component Orientation Suffix Device
Carrier Tape, Number Components Reel Reel Size
Package Carrier Width Pitch Part Full Reel Reel Size
8-Pin SOIC
2500
2002 Microchip Technology Inc.
DS21409B-page
TC3400
Package Dimensions
8-Pin Plastic
.260 (6.60) .240 (6.10)
.045 (1.14) .030 (0.76) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92)
.070 (1.78) .040 (1.02)
.310 (7.87) .290 (7.37)
.040 (1.02) .020 (0.51)
.015 (0.38) .008 (0.20) .400 (10.16) .310 (7.87)
MIN.
.110 (2.79) .090 (2.29)
.022 (0.56) .015 (0.38)
Dimensions: inches (mm)
8-Pin SOIC
.157 (3.99) .150 (3.81)
.244 (6.20) .228 (5.79)
.050 (1.27) TYP.
.197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) MAX. .050 (1.27) .016 (0.40) Dimensions: inches (mm) .010 (0.25) .007 (0.18)
DS21409B-page
2002 Microchip Technology Inc.
TC3400
NOTES:
2002 Microchip Technology Inc.
DS21409B-page
TC3400
NOTES:
DS21409B-page
2002 Microchip Technology Inc.
TC3400
SALES SUPPORT
Data Sheets Products supported preliminary Data Sheet have errata sheet describing minor operational differences recommended workarounds. determine errata sheet exists particular device, please contact following: Your local Microchip sales office Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision silicon Data Sheet (include Literature using. Customer Notification System Register site (www.microchip.com/cn) receive most current information products.
2002 Microchip Technology Inc.
DS21409B-page
TC3400
NOTES:
DS21409B-page
2002 Microchip Technology Inc.
TC3400
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2002 Microchip Technology Inc.
DS21409B-page
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DS21409B-page
2002 Microchip Technology Inc.
*B90412SD*
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