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CS5480 Fiches technique(PDF) 7 Page - Cirrus Logic |
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CS5480 Fiches technique(HTML) 7 Page - Cirrus Logic |
7 / 70 page CS5480 DS980F3 7 2.1 Analog Pins The CS5480 has a differential input (VIN ) for voltage input and two differential inputs IIN1 IIN2) for current1 and current2 inputs. The CS5480 also has two voltage reference pins (VREF ) between which a bypass capacitor should be placed. 2.1.1 Voltage Input The output of the line voltage resistive divider or transformer is connected to the (VIN ) input of the CS5480. The voltage channel is equipped with a 10x, fixed-gain amplifier. The full-scale signal level that can be applied to the voltage channel is ±250mV. If the input signal is a sine wave, the maximum RMS voltage is 250mVp/ 2 176.78 mV RMS, which is approximately 70.7% of maximum peak voltage. 2.1.2 Current1 and Current2 Inputs The output of the current-sensing shunt resistor, transformer, or Rogowski coil is connected to the IIN1 or IIN2 input pins of the CS5480. To accommodate different current-sensing elements, the current channel incorporates a programmable gain amplifier (PGA) with two selectable input gains, as described in Config0 register description section 6.6.1 Configuration 0 (Config0) – Page 0, Address 0 on page 37. There is a 10x gain setting and a 50x gain setting. The full-scale signal level for current channels is ±50mV and ±250mV for 50x and 10x gain settings, respectively. If the input signal is a sine wave, the maximum RMS voltage is 35.35mVRMS or 176.78mVRMS, which is approximately 70.7% of maximum peak voltage. 2.1.3 Voltage Reference The CS5480 generates a stable voltage reference of 2.4V between the VREF pins. The reference system also requires a filter capacitor of at least 0.1µF between the VREF pins. The reference system is capable of providing a reference for the CS5480 but has limited ability to drive external circuitry. It is strongly recommended that nothing other than the required filter capacitor be connected to the VREF pins. 2.1.4 Crystal Oscillator An external, 4.096MHz quartz crystal can be connected to the XIN and XOUT pins, as shown in Figure 1. To re- duce system cost, each pin is supplied with an on-chip load capacitor. Alternatively, an external clock source can be connected to the XIN pin. 2.2 Digital Pins 2.2.1 Reset Input The active-low RESET pin, when asserted for longer than 120µs, will halt all CS5480 operations and reset internal hardware registers and states. When de-asserted, an initialization sequence begins, setting default register values. To prevent erroneous noise-induced resets to the CS5480, an external pull-up resistor and a decoupling capacitor are necessary on the RESET pin. 2.2.2 Digital Outputs The CS5480 provides three configurable digital outputs (DO1-DO3). They can be configured to output energy pulses, interrupt, zero-crossings, or energy directions. Refer to the description of the Config1 register in section 6.6.2 Configuration 1 (Config1) – Page 0, Address 1 on page 38 for more details. 2.2.3 UART/SPI™ Serial Interface The CS5480 provides five pins—SSEL, RX/SDI, TX/SDO, CS, and SCLK—for communication between a host microcontroller and the CS5480. SSEL is an input that, when low, indicates to the CS5480 to use the SPI port as the serial interface to communicate with the host microcontroller. The SSEL pin has an internal weak pull-up. When the SSEL pin is left unconnected or pulled high externally, the UART port is used as the serial interface. XIN XOUT C1 = 22pF C2 = 22pF Figure 1. Oscillator Connections |
Numéro de pièce similaire - CS5480 |
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Description similaire - CS5480 |
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