TS1100/01/02/03 Current Sense Amplifier EVB User's Guide The TS1100/01/02/03 Unidirectional and Bidirectional Current Sense Amplifiers consume a very low 0.68 μA supply current. The TS1100 and TS1101 high-side current sense amplifiers (CSA) combine a 100 μV (max) input offset voltage (VOS) and a 0.6% (max) gain error (GE), with both specifications optimized for any precision current measurement. The TS1102 and TS1103 CSAs combine a 200 μV (max) VOS and a 0.6% (max) GE for cost-sensitive applications. For all high-side current sensing applications, the TS1100/01/02/03 CSAs are self-powered and feature a wide input common-mode voltage range from 2 to 27 V. For the bidirectional CSAs, TS1101 and TS1103, a SIGN comparator digital output is provided that indicates the direction of current flow. All CSAs are specified for operation over the -40 ºC to +105 ºC temperature range. KEY FEATURES • RSENSE: 50 mΩ ± 0.5% • Compatible for All Gain Options • 25 V/V • 50 V/V • 100 V/V • 200 V/V ORDERING INFORMATION • TS1100-25DB • TS1100-50DB • TS1100-100DB • TS1100-200DB • TS1101-25DB • TS1101-50DB • TS1101-100DB • TS1101-200DB • TS1102-25DB • TS1102-50DB • TS1102-100DB • TS1102-200DB • TS1103-25DB • TS1103-50DB • TS1103-100DB • TS1103-200DB silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 TS1100/01/02/03 Current Sense Amplifier EVB User's Guide TS1100/02-EVB Description 1. TS1100/02-EVB Description The evaluation board for the TS1100 or TS1102 is a completely assembled and tested circuit board that can be used for evaluating the current-sense amplifier for all four gain options; i.e., 25 V/V, 50 V/V, 100 V/V, and 200 V/V. The board is configured with an RSENSE = R1 = 60 mΩ resistor. The board has a dedicated RS+ = VBATT, RS– = LOAD, and output voltage OUT = VOUT test points. For additional information, refer to the TS1100/01/02/03 product data sheet. The demo board includes an optional on-board 0.1μF decoupling capacitor (not installed) at the VBATT input pin and a 47 nF capacitor at the VOUT output pin. Depending on the load current desired, an external resistor or active load is to be connected to the LOAD pin. Table 1.1. TS1100/02 Component List Designation Quantity Description U1 1 TS1100-25 / TS1100-50 / TS1100-100 / TS1100-200 / TS1102-25 / TS1102-50 / TS1102-100 / TS1102-200 C1 Not installed 0.1 μF ±10% capacitor (0805) C2 1 47 nF ±10% capacitor (0805) R1 1 50 mΩ ± 1% (0805) VDD, VBATT, VOUT 3 Test Points silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 1 TS1100/01/02/03 Current Sense Amplifier EVB User's Guide TS1100/02-EVB Quick Start Procedure 2. TS1100/02-EVB Quick Start Procedure Required Equipment: • TS1100 or TS1102 demo board • One dc power supply (HP Model HP6624A or equivalent) • Two digital voltmeters • Load resistor or an active load (value varies depending on ILOAD desired) Table 2.1. Demo Board Test Points Signal Eval Board RS+ VBATT RS– LOAD OUT VOUT GND GND Table 2.2. Demo Board Test Setup Per Gain Setting GAIN (V/V) VBATT (V) ILOAD(mA) RLOAD(Ω) VOUT(V) MAX VSENSE(mV) 25 6 1600 3.75 2 80 50 6 800 7.5 2 40 100 6 400 15 2 20 200 6 200 30 2 10 To evaluate the TS1100/02 current-sense amplifier circuit, perform the following steps: 1. Before connecting the dc power supply to the demo board, turn on the power supply, set the dc voltage to 6 V, set its short circuit current limit to 10% higher than the maximum load current in the application, and then turn it off. 2. Connect the dc power supply positive terminal to the pad labeled VBATT and its negative terminal to the adjacent pad labeled GND. 3. Connect a digital voltmeter to the test points labeled TP+ and TP– to measure VSENSE. 4. Connect the positive terminal of a second digital voltmeter to the test point labeled VOUT and the negative terminal to the adjacent test point labeled GND. 5. Based on the selective gain option of the current sense amplifier, select the load register or an active load according to the table above. Connect one end of this resistor or active load to the pad labeled LOAD and the other end to the adjacent pad labeled GND. 6. Turn on the power supply and observe the output voltage at VOUT. The expression for the TS1100's output voltage is given by: ROUT V OUT = I LOAD × 50mΩ × R1 where the TS1100's internal ROUT and R1 resistor values are listed in the following table: Table 2.3. TS1100's Internal Gain Setting Resistors (Typical Values) Gain (V/V) R1 (Ω) ROUT (Ω) 25 400 10K 50 200 10K 100 100 10K 200 100 20K 7. The TS1100's actual output voltage VOUT will depend on the TS100's actual offset voltage VOS, its gain error GE, sense resistor (RSENSE) tolerance of ±1% and the load resistor tolerance/active load accuracy. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 2 TS1100/01/02/03 Current Sense Amplifier EVB User's Guide TS1100/02-EVB Quick Start Procedure Figure 2.1. TS1100/02 Demo Board Circuit Schematic silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 3 TS1100/01/02/03 Current Sense Amplifier EVB User's Guide TS1101/03-EVB Description 3. TS1101/03-EVB Description The evaluation board for the TS1101 or TS1103 is a completely assembled and tested circuit board that can be used for evaluating the current-sense amplifier for all (4) gain options; i.e., 25V/V, 50V/V, 100V/V, and 200V/V. The board is configured with an R = R1 = 50 mW resistor. The board has a dedicated RS+ = VBATT, RS– = LOAD, and output voltage OUT = VOUT test points. The TS1101 and TS1103 evaluation boards also have VDD and SIGN test points. For additional information, refer to the TS1100/01/02/03 product data sheet. The demo board includes an optional onboard 0.1 mF decoupling capacitor (not installed) at the VBATT inpujt pin and a 47 nF capacitor at the VOUT output pin. Depending on the load current desired, an external resistor or active load is to be connected at the LOAD pin. Because the TS1101 and TS1103 are bidirectional current-sense amplifiers, their demo boards can be set up to sense current in both directions. Please refer to Table 4.2 VBATT and LOAD Test Point Connections Per ILOAD Direction on page 5 for the proper connections fo VBATT and LOAD test points. The direction of the current is known based on the voltage level of the SIGN pin. If VRS+ > VRS–, the SIGN pin is a logic HIGH or VDD voltage. If VRS– > VRS+, the SIGN pin is a logic LOW or GND voltage. A VDD test pint is available and powers the internal comparator that monitors the direction of the load current. The output voltage of the comparator is the voltage on the SIGN pin. Table 3.1. TS1101/03 Component List Designation Quantity Description U1 1 TS1101-25 / TS1101-50 / TS1101-100 / TS1101-200 /TS1103-25 /TS1103-50 / TS1103-100 / TS1103-200 C1 Not installed 0.1 μF ±10% capacitor (0805) C2 1 47 nF ±10% capacitor (0805) R1 1 50 mΩ ± 1% (0805) VDD, VBATT, VOUT, SIGN, LOAD 5 Test Points silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 4 TS1100/01/02/03 Current Sense Amplifier EVB User's Guide TS1101/03-EVB Quick Start Procedure 4. TS1101/03-EVB Quick Start Procedure Required Equipment: • TS1101 or TS1103 demo board • One dc power supply (HP Model HP6624A or equivalent) • Three digital voltmeters • Load resistor or an active load (value varies depending on ILOAD desired) Table 4.1. Demo Board Test Points Signal Demo Board RS+ VBATT RS– LOAD OUT VOUT GND GND VDD VDD SIGN SIGN Table 4.2. VBATT and LOAD Test Point Connections Per ILOAD Direction Test Point VRS+>VRS– VRS–>VRS+ VBATT input voltage load LOAD load ipnut voltage Table 4.3. Demo Board Test Setup Per Gain Setting GAIN (V/V) VBATT (V) ILOAD(mA) 25 6 1600 50 6 100 200 VDD (V) RLOAD(Ω) VOUT(V) MAX VSENSE(mV) 1.8 3.75 2 80 800 1.8 7.5 2 40 6 400 1.8 15 2 20 6 200 1.8 30 2 10 To evaluate the TS1101/03 bi-directional current-sense amplifier circuit, perform the following steps: 1. Before connecting the dc power supply to the demo board, turn on the power supply, set the dc voltage to 6 V on one output and the other to 1.8 V. Set the short circuit current limit on each output to 10% higher than the maximum load current in the application, and then turn it off. 2. For applications where VRS+ > VRS–, connect the 6 V dc power supply positive terminal to the test point VBATT and its negative terminal to the test point GND. Connect the 1.8 V power supply positive terminal to the test point VDD and its negative terminal to the test point GND. See Table 4.2 VBATT and LOAD Test Point Connections Per ILOAD Direction on page 5 for applications where VRS– > VRS+. 3. Connect a digital voltmeter to the test points TP+ and TP- to measure VSENSE. 4. Connect the positive terminal of a second digital voltmeter to the test point VOUT and the negative terminal to the test point GND. 5. To monitor the direction of the current, connect the positive terminal of a third digital voltmeter to the test point SIGN and the negative terminal to the test point GND. 6. Based on the selected gain option of the current sense amplifier, select the load resistor or an active load according to Table 4.3 Demo Board Test Setup Per Gain Setting on page 5. Connect one end of this resistor or active load to the test point LOAD and the other end to the test point GND. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 5 TS1100/01/02/03 Current Sense Amplifier EVB User's Guide TS1101/03-EVB Quick Start Procedure 7. Turn on the power supply and observe the output voltage at VOUT. The expression for the TS1101/03's output voltage is given by: ROUT V OUT = I LOAD × 50mΩ × RGAIN A/ B where the TS1101/03's internal ROUT and RGAIN[A/B] resistor values are listed in the following table: Table 4.4. TS1101's Internal Gain Setting Resistors (Typical Values) Gain (V/V) R1 (Ω) ROUT (Ω) 25 400 10K 50 200 10K 100 100 10K 200 100 20K 8. The TS1101/03's actual output voltage VOUT will depend on the TS1101/03's actual offset voltage VOS, its gain error GE, sense resistor (RSENSE) tolerance of ±1%, and the load resistor tolerance/active load accuracy. Note: For applications where VRS->VRS+, connect test points VBATT and LOAD based on Table 4.2 VBATT and LOAD Test Point Connections Per ILOAD Direction on page 5, and follow the steps above. Figure 4.1. TS1101/03DB Demo Board Circuit Schematic silabs.com | Smart. Connected. Energy-friendly. Rev. 1.0 | 6 Smart. Connected. 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