NJU9214FG1

NJU9214 PRELIMINARY 4•3/4 DIGIT SINGLE CHIP DIGITAL MULTIMETER LSI ! GENERAL DESCRIPTION The NJU9214 is a 4•3/4 digits single chip digital multimeter LSI with 42 segments bargraph display. The NJU9214 realizes high precision of ±40,000 counts measurement by the NJRC original dual-slope A to D converter and realizes also quick response bargragh display and auto-ranging by another high speed dual-slope A to D converter. The input attenuator part is simplified because the resistor for resistance measurement is applied for voltage bleeder resistor. Furthermore, the NJU9214 realizes root-mean-square measurement for AC voltage and current by connecting a External RMS-DC Converter, and Data output by the on chip RS-232C interface circuit. The NJU9214 is suitable for high precision and high performance multimeter. PACKAGE OUTLINE NJU9214FG1 ! FEATURES • 4•3/4 Digit Display (Available for UP to ±39,999 Display) • 42 Segments Quick Response Bargraph Display • NJRC Original Dual-Slope A to D Converter (±40,000Counts) • High Speed Dual-Slope A to D Converter (±400Counts) • Quick Response Auto-Ranging (20times/sec) • Frequency/Capacitance/Tachometer/Adapter Measurement • Root-Mean-Square Measurement by connecting a External RMS-DC Converter • External Relay Driving • Data Memory/Data Hold/Relative Display/MAX, MIN Display • Power-on Initializing • Auto Power-off • Buttery Life Detector • Rotary/Push SW Mode Selection • 1/4 Duty LCD Display Driver • Piezo Buzzer Direct Driving • RS-232C Interface • External Reference Input required • Low Operating Current • C-MOS Technology • Package Outline TQFP100 NJU9214 !BLOCK DIAGRAM REGURATOR REFERENCE VREF1 VREF2 RESISTORS and SWITCHS VDDA AGND VSSA +5.0V 0V -5.0V IVSL, IVSL IVSL, IVSH VI, VI, VR2 to 7, OVH, OVH, OVX ADP SGND VDDD VSSD 0V 0V 5.0V VREF3 A EXTERNAL SWITCH NETWORK DCV, ACV, DCV, ACV, ,CAP CAP, Ω, , ,CAP, DCmA, ACmA, DCmA, ACmA, FRQ, FRQ, rpm REFERENCE BUFFER BATT LOW DETECTOR FRQ ANALOG SECTION COM HIGH SPEED A/D SECTION HIGH RESOLUTION A/D SECTION CAPACITOR A/D SECTION BUFFER CONVERTER RMS-DC RMSIN RMSIN SWITCH HIGH SPEED A/D I/F I/F NETWORK I/F HIGH HIGH RESOLUTION A/D I/F RD1 to 4 RELAY CONTROLER SWITCH NETWORK CONTROLER HIGH SPEED A/D CONTROLER HIGH RESOLUTION A/D CONTROLER POWER ON INITIALIZE DIGITAL SECTION 4bitBUS FC1 to 4, KI1 to 5 KEY CONTROLE RS232C CONTROLER BUZZER CONTROLER 4bit CPU LCD CONTROLER LCD DRIVER and TXD DTR DSR TRX TXS RST PON KEY MATRIX TEST OSC POWER POWER BZ BUZZER COM1 to 4 SEG1 to 28 T1 to T3 XT1 XT2 RS232C DRIVER LCD NJU9214 ! PIN CONFIGURATION VSSA SLEEP SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 VSSD VDSP CIF2 CIF1 DTR DSR TXD 65 BLD XT1 B UF CL2 CH2 VREF3 VREF2 VREF1 CH1 CL1 INT1 INT2 SGND2 SGND1 AGND IVSH IVSL ADP OVX OVH VR7 VR6 VR5 VR4 VR3 VR2 V1 75 70 XT2 BZ 60 55 50 SEG16 SEG15 SEG14 SEG13 80 45 SEG12 SEG11 SEG10 SEG9 SEG8 85 40 NJU9214FG1 90 35 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 COM4 COM3 CMO2 COM1 T3 T2 T1 RST PON 95 30 100 1 5 10 15 20 25 ACOUT RMSIN VDDD VDDA RD1 RD2 RD3 RD4 RC0 RC1 RC2 RC3 FC1 FC2 TRX FC4 KI1 KI2 KI3 KI4 RMS TXS KMS ! TERMINAL DESCRIPTION No. 1 2 3 4 5 to 8 9 10 11 12 13 to 20 17 to 20 21 to 25 SYMBOL AC OUT VD D A RMSIN VD D D RD 1 to RD 4 TXS TRX KMS RMS RC 0 to RC 3 FC 1 to FC 4 KI1 to KI5 I/O Out In Out In In In In In I/O In FUNC TION Attenuator output termi nal (used at AC A, AC mA, FRQ, rpm) Analog VD D (VD D A = 5.0 ± 0.25V) RMS-Voltage Input T rmi nal e D i gi tal VD D (VD D D = 5.0 ± 0.25V) Relay D ri vi ng T rmi nal e RS232C Output-Rate Select T rmi nal L ; 9600bps H ; 2400bps e RS232C Functi on Select T rmi nal e Key Mode Select T rmi nal e Range C ontrol Mode Select T rmi nal e Range Select T rmi nal wi th Input Pull-up Resi stance (300kΩ) e Functi on Select T rmi nal wi th Input Pull-up Resi stance (300kΩ) e Opti onal Functi on C ontrol T rmi nal wi th Input Pull-up Resi stance (300kΩ) e FC3 KI5 NJU9214 No. 26 27 28 to 30 SYMBOL PON RST T1 to T3 I/O In In In Out Out In Out Out Out Out In I/0 Out In I/0 Out I/0 F UNC TION Auto Power-off Mode Release Terminal with Input Pull-up Resistance (300Ωk) System Reset Terminal with Input Pull-up Resistance(10kΩ) Test Terminal with Input Pull-up Resistance (300kΩ) LCD Common Terminal LCD Segment Terminal RS232C Data Set Ready Terminal RS232C Data-Terminal Terminal RS232C Data Output Terminal Piezo Buzzer Driving Terminal Crystal oscillation Inverter (Output) Crystal oscillation Inverter (Input) LCD driving voltage I/O Terminal Opened : VDSP=(VDDD-VSSD) X 3/5 Connected to VSSD : VDSP=(VDDD-VSSD) Digital VSS VSSD=0V Auto Power-off signal Terminal (Power-off:"H" Level) Analog VSS VSSA=-5.0V Buttery Life Detector Terminal, Detection: BLD1sec) Measurement Mode Auto 1push(