71M6521FE-IMSLASHF datasheet(5/101 Pages) TERIDIAN

5 / 101 page

71M6521DE/71M6521FE

Energy Meter IC

DATASHEET

JANUARY 2008

v1.0

Page: 5 of 101

List of Figures

Figure 1: IC Functional Block Diagram...........................................................................................................................8

Figure 2: General Topology of a Chopped Amplifier ....................................................................................................11

Figure 3: AFE Block Diagram.......................................................................................................................................12

Figure 4: Samples from Multiplexer Cycle....................................................................................................................15

Figure 5: Accumulation Interval....................................................................................................................................15

Figure 6: Interrupt Structure .........................................................................................................................................36

Figure 7: Optical Interface...........................................................................................................................................39

Figure 8: Connecting an External Load to DIO Pins.....................................................................................................41

Figure 9: 3-Wire Interface. Write Command, HiZ=0. ....................................................................................................43

Figure 10: 3-Wire Interface. Write Command, HiZ=1 ...................................................................................................44

Figure 11: 3-Wire Interface. Read Command...............................................................................................................44

Figure 12: 3-Wire Interface. Write Command when CNT=0.........................................................................................44

Figure 13: 3-Wire Interface. Write Command when HiZ=1 and WFR=1.......................................................................44

Figure 14: Functions defined by V1..............................................................................................................................45

Figure 15: Voltage. Current, Momentary and Accumulated Energy .............................................................................47

Figure 16: Timing Relationship between ADC MUX, Compute Engine, and Serial Transfers. .....................................48

Figure 17: RTM Output Format ....................................................................................................................................49

Figure 18: Operation Modes State Diagram.................................................................................................................51

Figure 19: Functional Blocks in BROWNOUT Mode (inactive blocks grayed out)........................................................52

Figure 20: Functional Blocks in LCD Mode (inactive blocks grayed out)......................................................................53

Figure 21: Functional Blocks in SLEEP Mode (inactive blocks grayed out) .................................................................54

Figure 22: Transition from BROWNOUT to MISSION Mode when System Power Returns .........................................55

Figure 23: Power-Up Timing with V3P3SYS and VBAT tied together ..........................................................................55

Figure 24: Power-Up Timing with VBAT only ...............................................................................................................56

Figure 25: Wake Up Timing..........................................................................................................................................57

Figure 26: MPU/CE Data Flow .....................................................................................................................................58

Figure 27: MPU/CE Communication ............................................................................................................................58

Figure 28: Resistive Voltage Divider (Left), Current Transformer (Right) .....................................................................59

Figure 29: Resistive Shunt ...........................................................................................................................................59

Figure 30: Crystal Frequency over Temperature..........................................................................................................61

Figure 31: Crystal Compensation.................................................................................................................................62

Figure 32: Connecting LCDs ........................................................................................................................................63

Figure 33: I

2C EEPROM Connection............................................................................................................................65

Figure 34: Three-Wire EEPROM Connection...............................................................................................................66

Figure 35: Connections for the RX Pin.........................................................................................................................66

Figure 36: Connection for Optical Components ...........................................................................................................67

Figure 37: Voltage Divider for V1 .................................................................................................................................68

Figure 38: External Components for the RESET Pin: Push-Button (Left), Production Circuit (Right)...........................68

Figure 39: External Components for the Emulator Interface ........................................................................................69

Figure 40: Wh Accuracy, 0.1A to 200A at 240V/50Hz and Room Temperature...........................................................93

Figure 41: Meter Accuracy over Harmonics at 240V, 30A............................................................................................93

Figure 42: Typical Meter Accuracy over Temperature Relative to 25°C.......................................................................94

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