PDF DS2740BU Data sheet ( Hoja de datos )

Número de pieza	DS2740BU
Descripción	High-Precision Coulomb Counter
Fabricantes	Dallas Semiconducotr
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No Preview Available ! www.maxim-ic.com FEATURES § 15-Bit Bidirectional Current Measurement (DS2740) § 1.56mV LSB and ±51.2mV Dynamic Range § 78mA LSB and ±2.56A Dynamic Range with External 20mW Sense Resistor (RSNS) § 156mA LSB and ±5.12A Dynamic Range with External 10mW Sense Resistor (RSNS) § 13-Bit Bidirectional Current Measurement (DS2740B) § 6.25mV LSB and ±51.2mV Dynamic Range § 312mA LSB and ±2.56A Dynamic Range with External 20mW Sense Resistor (RSNS) § 625mA LSB and ±5.12A Dynamic Range with External 10mW Sense Resistor (RSNS) § Analog Input Filter (IS1, IS2) Extends Dynamic Range for Pulse-Load Applications § Current Accumulation Register Resolution § 6.25mVhr (Both DS2740 and DS2740B) § 0.3125mAhr with External 20mW RSNS § 0.6250mAhr with External 10mW RSNS § Dallas 1-Wire® Interface § Unique 64-Bit Device Address § Standard and Overdrive Timings (OVD) § Low Power Consumption: § Active Current: 65mA max § Sleep Current: 1mA max DS2740 High-Precision Coulomb Counter PIN CONFIGURATION OVD 1 8 VDD PIO 2 7 DQ SNS IS2 3 4 6 VSS 5 IS1 mMAX (DS2740U, DS2740BU) See Table 1 for Ordering Information. See Table 2 for Detailed Pin Descriptions. PIN DESCRIPTION OVD- 1-Wire Bus Speed Select PIO - Programmable I/O Pin SNS - Sense Resistor Input IS2 - Current-Sense Input IS1 - Current-Sense Input VSS - Device Ground, Current-Sense Resistor Return DQ - Data Input/Output VDD - Power-Supply Input (2.7V to 5.5V) 1-Wire is a registered trademark of Dallas Semiconductor. 1 of 15 033103 1 page DS2740 PART DS2740 DS2740B CONVERSION TIME 3.515s 0.878s CURRENT RESOLUTION (1 LSB) VIS1 - VIS2 20mW RSNS 15mW 10mW 5mW 1.5625mV 78.13mA 104.2mA 156.3mA 312.5mA 6.250mV 312.5mA 416.7mA 625mA 1.250mA Every 1024th conversion, the ADC measures its input offset to facilitate offset correction. Offset correction occurs approximately once per hour in the DS2740 and four times per hour in the DS2740B. The resulting correction factor is applied to the subsequent 1023 measurements. During the offset correction conversion, the ADC does not measure the IS1 to IS2 signal. A maximum error of 1/1024 in the accumulated current register (ACR) is possible, however, to reduce the error, the current measurement just prior to the offset conversion is displayed in the current register and is substituted for the dropped current measurement in the current accumulation process. The typical error due to offset correction is much less than 1/1024. CURRENT ACCUMULATOR Current measurements are internally summed, or accumulated, at the completion of each conversion period with the results displayed in the ACR. The accuracy of the ACR is dependent on both the current measurement and the conversion timebase. The ACR has a range of ±204.8mVh with an LSb of 6.25µVh. Additional registers hold fractional results of each accumulation, however, these bits are not user accessible. Read and write access is allowed to the ACR. Whenever the ACR is written, fractional accumulation results are cleared. Also, a write forces the ADC to measure its offset and update the offset correction factor. The current measurement and accumulation begin with the second conversion following a write to the ACR. Figure 4 describes the ACR address, format, and resolution. Figure 4. CURRENT ACCUMULATOR FORMAT MSB—Address 10 LSB—Address 11 S 214 213 MSb 212 211 210 29 28 LSb 27 26 25 24 23 22 21 20 MSb LSb Units: 6.25mVh/Rsns PART DS2740 DS2740B UPDATE INTERVAL 3.515s 0.878s VIS1- VIS2 6.25mVh 20mW 312.5mAh ACR LSB RSNS 15mW 10mW 416.7mAh 625mAh 5mW 1.250mAh 5 of 15 5 Page Figure 10. NET ADDRESS COMMAND FLOW CHART MASTER Tx RESET PULSE DS2740 Tx PRESENCE PULSE MASTER Tx NET ADDRESS COMMAND DS2740 33h / 39h READ NO 55h MATCH NO F0h SEARCH NO CCh SKIP NO A5h RESUME NO YES DS2740 Tx FAMILY CODE 1 BYTE DS2740 Tx SERIAL NUMBER 6 BYTES DS2740 Tx CRC 1 BYTE YES MASTER Tx BIT 0 YES DS2740 Tx BIT 0 DS2740 Tx BIT 0 MASTER Tx BIT 0 YES MASTER Tx FUNCTION COMMAND BIT 0 NO NO MATCH ? BIT 0 MATCH ? YES MASTER Tx BIT 1 YES DS2740 Tx BIT 1 DS2740 Tx BIT 1 MASTER Tx BIT 1 YES RESUME NO FLAG SET ? YES MASTER Tx FUNCTION COMMAND MASTER Tx FUNCTION COMMAND BIT 1 NO NO MATCH ? BIT 1 MATCH ? YES YES MASTER Tx BIT 63 DS2740 Tx BIT 63 DS2740 Tx BIT 63 MASTER Tx BIT 63 SET RESUME FLAG YES BIT 63 MATCH ? NO 11 of 15 11 Page

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