SD Diff Channels Meterage SOC with UART and I 2 C. Features. Description. Applications

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1 SD0 Diff Channels Meterage SOC with UART and I C Features High precision bits ADC, selectable gain at //8/6, differential or Pseudo-differential inputs. Measures signal s true RMS value, instantaneous value, and frequency 8 bits RISC low power MCU, instructions and 6 stack levels. The MCU current consumption is 00uA typically at.v and.0mhz operating clock rate. Standby current is.6ua at khz clock, and less than ua at sleep 6k Bytes OTP, Bytes SRAM Built-in low frequency crystal oscillator, RC oscillator, and PLL to provide flexible clock selection Built-in.6V low TC voltage reference RTC module together with external.68khz crystal provides calendar/time information including leap year, timing accuracy is adjustable Peripheral resources: UART, I C, PWM, PFD, TIMER, external interrupts All I/O have Schmidt trigger inputs and pull up resistors Low voltage detection and power on reset circuit Operating voltage range:.v~.6v Operating temperature range: -0 ~ 8 Description SD0 is a CMOS SOC with built-in bits ADC. Input channels can be set as three differentials or five Pseudo-differentials. Input gain factor is selectable. Thus different needs can be satisfied. AC or DC signals are measured directly. AC signal does not have to go through external rectification circuit. The SOC is highly integrated. Very few external components are needed for AC/DC voltmeter or current meter realization. Built-in UART and I C ports simplify communication to computer or other devices. The OTP can be programmed in situ and the programming voltage is generated internally. Data that do not change frequently such as calibration factors can be stored in OTP in place of external EEPROM. The IC was designed with ultra-low power technology. Typical total operating current is only.ma. Three working modes are provided so users can select the optimum choice between speed and power. They are normal mode, standby mode, and sleep mode. If external oscillator is used but stopped due to interference, the internal RC oscillator becomes the new MCU clock source automatically. The IC passes kv Electrical Fast Transient (EFT) test easily without using any additional protection circuit. It is suitable for applications in harsh environment. Applications Three pairs DC or three phases AC voltmeter or current meter with UART/I C Single pair DC or single phase AC voltmeter or current meter with UART/I C Multi-channel DC or AC signal measurement with UART/I C ADC data output rate is selectable for appropriate choice between speed and precision. SDIC Microelectronics Rev. 0. October 0

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3 SD0 Ordering Information SSOP package Pin Diagram and Descriptions XIN XOUT AR AVSS AI AI/P0 AI/P AI/P AI/P P0//INT SDIC XXXXXXX SD PLLC DVSS VPP P P P0 P P/ P0/ P/PFD/PWM P//INT Figure. Pin out diagram Table. Pin Descriptions Pin No. Pin Name Attribute Descriptions XIN Analog Crystal oscillator input XOUT Analog Crystal oscillator input AR Analog Internal LDO output for IC s analog module, connect uf capacitor to AVSS AVSS Ground Analog ground -6 Analog --AI input Analog signal differential or two Pseudo-differential inputs -0 AI/P0--AI/P Analog Two analog differential or four Pseudo-differential inputs, or digital port P0- input, I/O.6V reference voltage for ADC, can connect to external reference source, Analog connect 00pF and 0uF capacitor to AVSS P0//INT0 I/O Digital port P0, I C port, or external interrupt INT0 P//INT I/O Digital port P, I C port, or external interrupt INT P/PFD/PWM I/O Digital port P or PFD/PWM output P0/ I/O Digital port P0 or UART port 6 P/ I/O Digital port P or UART port P I/O Digital port P 8-0 P0 P I/O Digital port P0- OTP high voltage programming pin, connect uf capacitor to DVSS,internally VPP Analog boosted to.v during programming Power Power supply for the IC, connect 0.uF to DVSS SDIC Microelectronics Rev. 0. October 0 of

4 P-0 P-0 P P-0 P P-0 PLLC XIN XOUT DVSS SD0 DVSS Ground Digital ground PLLC Analog PLL capacitor, connect nf to DVSS Remark: All I/O ports Pnn have internal pull-up option (default OFF) and input hysteresis at 0./0.. Functional Block RC OSC PLL Crystal OSC POR/LVD Power Management AR AVSS Timing Control Generator ADC M U X - VPP OTP 6k Bytes WDT Voltage Reference 8 Bits RISC MCU Special Register SRAM Bytes I C UART PWM PFD PWM/ PFD External Interrupts INT-0 I/O Control Timer/Counter T0/T Figure. Functional block diagram SDIC Microelectronics Rev. 0. October 0 of 8

5 SD0 Typical Application U Vin Vout C pf C pf P Y P.68 khz C 00pF Signal input 0mA/0V PTC AR AI C 0uF/6V W F R K 0V AC power input R R R 0k 0k 0k U SD0 XIN PLLC XOUT DVSS AR AVSS VPP P 0 6 AI P AI/P0 P0 8 8 AI/P P AI/P P/ 6 0 AI/P P0/ P/PFD/PWM P0//INT0 P//INT RX C 0 X 0VAC/6V/VA D D N8 N8 R k R k C6 C nf AR C uf 0nF C8 uf C 0.uF C nf C6 nf AI R, R, R, RX use ±0ppm/ thru hole resistors Voltage measurement : W open, RX=0Ω Current measurement : W shorted, RX=0mΩ Voltage across D/D must be within 00mV The sides of RX should have a non-current flowing single point connection to SD0' s AVSS pin. T D W0 C C C0 0uF/6V 0.uF 0.uF U R0 k U R8 k UART Opto-coupler R k R k S S S EL8c EL8c S S P C 0uF/6V S and S a re external isolated power R6 R.k.k P I C Figure. Single phase voltage meter/current meter typical application diagram SDIC Microelectronics Rev. 0. October 0 of 8

6 SD0 U Vin Vout P 0mA/0V PTC F R K C 0 X 0VAC/6V/VA T D W0 C8 0uF/6V C 0.uF C0 0.uF C 0uF/6V 0V AC power input C pf Y C pf.68 khz C 00pF AR AI C 0uF/6V U SD0 XIN PLLC XOUT DVSS AR AVSS VPP P 0 6 AI P AI/P0 P0 8 8 AI/P P AI/P P/ 6 0 AI/P P0/ P/PFD/PWM P0//INT0 P//INT C nf C uf C6 uf AR C 0.uF UART opto-coupler S R R0 k k U EL8c S S P V+ V- V+ V- V+ V- R k R k R k R k R k R6 k C6 C C C nf 0nF C8 nf AI AI C0 nf 0nF C nf AI AI C nf 0nF C nf AI R R.k.k P I C U R k S R8 k EL8c S S and S are external isolated power The sides of R /R/R6 should each have a non-current flowing single point connection to SD0' s AVSS pin. Figure. Three phases voltage meter/current meter typical application diagram SDIC Microelectronics Rev. 0. October 0 of 8

7 SD0 Electrical Specifications Table. Absolute Maximum Ratings Symbol Parameter Minimum Maximum Unit T A Operating temperature C T S Storage temperature - +0 C V DD Supply voltage V Vpp Programming voltage V V IN, V OUT Digital input/output voltage -0. V DD +0. V T L Reflow temperature profile Per IPC/JEDECJ-STD-00C C Remarks:. CMOS device can easily be damaged by electrostatics. It must be stored in conductive foam, and careful not to exceed the operating voltage range.. Turn off power before insert or remove the device. Table. Electrical Specifications(=.V, T A = ) Symbol Parameter Minimum Typical Maximum Unit Conditions/Remarks Power supply.0..6 V Digital circuits operate down to.0v FOSC Operating frequency MHz ILRC CRYXT Internal RC oscillator frequency Crystal oscillator frequency FOSC must be around MHz when read/write tables in OTP khz Frequency value after calibration.68 khz FPLL PLL output frequency. MHz IDD Operating current. ma IDD Operating current.6 ua IDD Operating current ua Fsam ADC sampling rate MHz CRYXT clock source, can select ILRC instead FPLL/ freq for MCU clock PLL input clock = CRYXT Analog modules active Internal RC oscillator for MCU clock MCU at standby mode Analog modules inactive MCU at sleep mode Analog modules inactive OSR Over sampling rate Can select between 8 to 68 GAIN ADC gain 6 //8/6 selectable ENOB Effective number of bits. -- bits Gain= NMbit No missing code bits SD0AX INL Integral nonlinearity %FSR With external VINdif VINabs ADC differential input voltage range ADC absolute input voltage range V Gain= AR+0. V Gain= ACFreq AC input signal frequency Hz SDIC Microelectronics Rev. 0. October 0 6 of 8

8 SD0 Vnrms RMS noise uvrms Gain= Voltage reference.6 V Rvref output resistance kω TCvref Vref TC -- ±0 -- ppm/ avddrx[:0]=00 Vavddr AR output voltage avddrx[:0]=0 V avddrx[:0]= avddrx[:0]= Iavddr AR output current ma POR Power on reset voltage V LVD Low voltage detect threshold V THlbt LVD hysteresis mv Digital I/O parameter IOL Low output current sink ma VOL=0.V IOH High output current source ma VOH=-0.V VIH Input high voltage V VIL Input low voltage V VOH Output high voltage V VOL Output low voltage VSS+0. V Rpu Pull up resistance =.0, P-0 kω =.0, other I/O SDIC Microelectronics Rev. 0. October 0 of 8

9 E c c A A A SD0 Package Information D E A c B B With Plating Base Metal? b b L L Cross section B-B b e Dimensions: mm Symbol Min. Nom. Max. A.00 A A.6..8 A D E E L 0..0 L.BSC b b c c e 0.6BSC θ 0 o 8 o Figure. SSOP mechanical specification SDIC Microelectronics Rev. 0. October 0 8 of 8