MCP42050-E/P Microchip

MCP41XXX MCP42XXX M MCP41XXX/42XXX Single/Dual Digital Potentiometer with SPI Interface Features Description 256 taps for each potentiometer The MCP41XXX and MCP42XXX devices are 256- position, digital potentiometers available in 10k , Potentiometer values for 10 k , 50 k and 50 k and 100k resistance versions. The 100 k MCP41XXX is a single-channel device and is offered in Single and dual versions an 8-pin PDIP or SOIC package. The MCP42XXX con- SPI serial interface (mode 0,0 and 1,1) tains two independent channels in a 14-pin PDIP, SOIC 1 LSB max INL & DNL or TSSOP package. The wiper position of the Low power CMOS technology MCP41XXX/42XXX varies linearly and is controlled via an industry-standard SPI interface. The devices con- 1 A maximum supply current in static operation sume <1 A during static operation. A software shut- Multiple devices can be daisy-chained together down feature is provided that disconnects the A (MCP42XXX only) terminal from the resistor stack and simultaneously con- Shutdown feature open circuits of all resistors for nects the wiper to the B terminal. In addition, the dual maximum power savings pin that performs the same MCP42XXX has a SHDN Hardware shutdown pin available on MCP42XXX function in hardware. During shutdown mode, the con- only tents of the wiper register can be changed and the Single supply operation (2.7V - 5.5V) potentiometer returns from shutdown to the new value. Industrial temperature range: -40C to +85C The wiper is reset to the mid-scale position (80h) upon power-up. The RS (reset) pin implements a hardware Extended temperature range: -40C to +125C reset and also returns the wiper to mid-scale. The MCP42XXX SPI interface includes both the SI and SO Block Diagram pins, allowing daisy-chaining of multiple devices. Chan- nel-to-channel resistance matching on the MCP42XXX RS SHDN varies by less than 1%. These devices operate from a V DD single 2.7 - 5.5V supply and are specified over the V SS PB0 extended and industrial temperature ranges. Resistor Wiper Control Array 0 Register Logic Package Types PA0 PW0 PDIP/SOIC PB1 CS CS 1 V 8 Wiper Resistor DD 16-Bit PA1 Register Array 1* SCK 2 7 PB0 SI Shift PW1 Register SI 6 3 PW0 SCK V 4 5 PA0 SS S0 *Potentiometer P1 is only available on the dual PDIP/SOIC/TSSOP MCP42XXX version. 14 CS 1 V DD 2 13 SCK SO SI 3 12 SHDN V 11 RS 4 SS PB1 5 10 PB0 PW1 9 PW0 6 PA1 7 8 PA0 2003 Microchip Technology Inc. DS11195C-page 1MCP41XXX/42XXX 1.0 ELECTRICAL CHARACTERISTICS DC CHARACTERISTICS: 10 k VERSION Electrical Characteristics: Unless otherwise indicated, V = +2.7V to 5.5V, T = -40C to +85C (TSSOP devices are only specified at +25C and DD A +85C). Typical specifications represent values for V = 5V, V = 0V, V = 0V, T = +25C. DD SS B A Parameters Sym Min Typ Max Units Conditions Rheostat Mode Nominal Resistance R 8 10 12 k T = +25C (Note 1) A Rheostat Differential Non Linearity R-DNL -1 1/4 +1 LSB Note 2 Rheostat Integral Non Linearity R-INL -1 1/4 +1 LSB Note 2 Rheostat Tempco R / T 800 ppm/C AB Wiper Resistance R 52 100 V = 5.5V, I = 1 mA, code 00h W DD W R 73 125 V = 2.7V, I = 1 mA, code 00h W DD W Wiper Current I -1 +1 mA W Nominal Resistance Match R/R 0.2 1 % MCP42010 only, P0 to P1 T = +25C A Potentiometer Divider Resolution N 8 Bits Monotonicity N 8 Bits Differential Non-Linearity DNL -1 1/4 +1 LSB Note 3 Integral Non-Linearity INL -1 1/4 +1 LSB Note 3 Voltage Divider Tempco V / T 1 ppm/C Code 80h W Full Scale Error V -2 -0.7 0 LSB Code FFh, V = 5V, see Figure 2-25 WFSE DD V -2 -0.7 0 LSB Code FFh, V = 3V, see Figure 2-25 WFSE DD Zero Scale Error V 0 +0.7 +2 LSB Code 00h, V = 5V, see Figure 2-25 WZSE DD V 0 +0.7 +2 LSB Code 00h, V = 3V, see Figure 2-25 WZSE DD Resistor Terminals Voltage Range V 0 V Note 4 A,B,W DD Capacitance (C or C ) 15 pF f = 1 MHz, Code = 80h, see Figure 2-30 A B Capacitance C 5.6 pF f = 1 MHz, Code = 80h, see Figure 2-30 W Dynamic Characteristics (All dynamic characteristics use V = 5V) DD Bandwidth -3dB BW 1 MHz V = 0V, Measured at Code 80h, B Output Load = 30 PF Settling Time t 2 SV = V ,V = 0V, 1% Error Band, Transition S A DD B from Code 00h to Code 80h, Output Load = 30 pF Resistor Noise Voltage e 9 nV/Hz V = Open, Code 80h, f =1 kHz NWB A Crosstalk C -95 dB V = V , V = 0V (Note 5) T A DD B Digital Inputs/Outputs (CS, SCK, SI, SO) See Figure 2-12 for RS and SHDN pin operation Schmitt Trigger High-Level Input Voltage V 0.7V V IH DD Schmitt Trigger Low-Level Input Voltage V 0.3V V IL DD Hysteresis of Schmitt Trigger Inputs V 0.05V HYS DD Low-Level Output Voltage V 0.40 V I = 2.1 mA, V = 5V OL OL DD High-Level Output Voltage V V - 0.5 V I = -400 A, V = 5V OH DD OH DD Input Leakage Current I -1 +1 A CS = V , V = V or V , includes V SHDN=0 LI DD IN SS DD A Pin Capacitance (All inputs/outputs) C , C 10 pFV = 5.0V, T = +25C, f = 1 MHz IN OUT DD A c Power Requirements Operating Voltage Range V 2.7 5.5 V DD Supply Current, Active I 340 500 A V = 5.5V, CS = V , f = 10 MHz, DDA DD SS SCK SO = Open, Code FFh (Note 6) Supply Current, Static I 0.01 1 A CS, SHDN, RS = V = 5.5V, SO = Open (Note 6) DDS DD Power Supply Sensitivity PSS 0.0015 0.0035 %/% V = 4.5V - 5.5V, V = 4.5V, Code 80h DD A PSS 0.0015 0.0035 %/% V = 2.7V - 3.3V, V = 2.7V, Code 80h DD A Note 1: V = V , no connection on wiper. AB DD 2: Rheostat position non-linearity R-INL is the deviation from an ideal value measured between the maximum resistance and the minimum resistance wiper positions. R-DNL measures the relative step change from the ideal between successive tap positions. I = 50 A for W V = 3V and I = 400 A for V = 5V for 10 k version. See Figure 2-26 for test circuit. DD W DD 3: INL and DNL are measured at V with the device configured in the voltage divider or potentiometer mode. V = V and V = 0V. DNL W A DD B specification limits of 1 LSB max are specified monotonic operating conditions. See Figure 2-25 for test circuit. 4: Resistor terminals A,B and W have no restrictions on polarity with respect to each other. Full-scale and zero-scale error were measured using Figure 2-25. 5: Measured at V pin where the voltage on the adjacent V pin is swinging full-scale. W W 6: Supply current is independent of current through the potentiometers. DS11195C-page 2 2003 Microchip Technology Inc.