High-Precision Coulomb Counter
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Catalog excerpts

High-Precision Coulomb Counter - 1

15-Bit Bidirectional Current Measurement (DS2740U) > 1 8 O VD DD 1.56 V LSB and 51.2mV Dynamic Range > PIOV 7 2 3 DQV SNS 6 78 A LSB and ѱ2.56A Dynamic Range with External 20m > 4 MAX > SS 5 Sense Resistor (R > IS1IS2 SNS ) 156 A LSB and 5.12A Dynamic Range with External 10m ( DS2740U , DS2740BU ) Sense Resistor (R > SNS ) See Table 1 for Ordering Information. See Table 2 for Detailed Pin Descriptions. 13-Bit Bidirectional Current Measurement (DS2740BU) 6.25 V LSB and ѱ51.2mV Dynamic Range > 312 A LSB and 2.56A Dynamic Range with External 20m OVD - 1-Wire Bus Speed Select PIO - Programmable I/O Pin SNS - Sense Resistor Input IS2 - Current-Sense Input IS1 - Current-Sense Input V Sense Resistor (R > SNS ) 625 A LSB and ѱ5.12A Dynamic Range with External 10m Sense Resistor (R > SS SNS ) - Device Ground, Current-Sense Resistor Return DQ - Data Input/Output V Analog Input Filter (IS1, IS2) Extends Dynamic Range for Pulse-Load Applications Current Accumulation Register Resolution > DD - Power-Supply Input (2.7V to 5.5V) 6.25 Vhr (Both DS2740U and DS2740BU) 0.3125mAhr with External 20m R > SNS 0.6250mAhr with External 10m R > SNS Dallas 1-Wire > Interface Unique 64-Bit Device Address Standard and Overdrive Timings (OVD) Low Power Consumption: Active Current: 65 A max Sleep Current: 1 A max > 1-Wire is a registered trademark of Dallas Semiconductor. 1 of 16 051805 size="-2">

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High-Precision Coulomb Counter - 2

PARTMARKINGDESCRIPTION DS2740U D2740 15-Bit Current Resolution, 8-Pin MAX DS2740U+ D2740 (see note) 15-Bit Current Resolution, Lead-Free 8-Pin MAX DS2740U/T&R D2740 15-Bit Current Resolution, 8-Pin MAX, Tape-and-Reel DS2740U+T&R D2740 (see note) 15-Bit Current Resolution, Lead-Free 8-Pin MAX, Tape-and-Reel DS2740BU 2740B 13-Bit Current Resolution, 8-Pin MAX DS2740BU+ 2740B (see note) 13-Bit Current Resolution, Lead-Free 8-Pin MAX DS2740BU/T&R 2740B 13-Bit Current Resolution, 8-Pin MAX, Tape-and-Reel DS2740BU+T&R 2740B (see note) 13-Bit Current Resolution, Lead-Free 8-Pin MAX, Tape-and-Reel...

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High-Precision Coulomb Counter - 3

V > DD STATUS/CONTROL PIO 1-WIRE DQ INTERFACE ACCUMULATEDCURRENT AND TIMEBASE ADDRESS CURRENT >

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High-Precision Coulomb Counter - 4

PINSYMBOLDESCRIPTION 1-Wire Bus Speed Control. Input logic level selects the speed of the 1-Wire bus. Logic 1 selects overdrive (OVD) and Logic 0 selects standard timing (STD). On a multidrop bus, all devices must operate at same speed. OVD 1 PIO 2 > Programmable I/O Pin. Programmed as input or output through internal registers. Open-drain output sufficient for LED or vibrator activation. SNS 3 > Current-Sense Resistor Input IS2 4 > Current-Sense Input. Connected to SNS through a 10k resistor to allow filtering of the current waveform by an external capacitor. IS1 5 > Current-Sense Input....

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High-Precision Coulomb Counter - 5

The DS2740 has two power modes: Active and Sleep. While in Active mode, the DS2740 operates as a high-precision coulomb counter with current and accumulated current measurement blocks operating continuously and the resulting values updated in the measurement registers. Read and write access is allowed to all registers. PIO pin is active. In Sleep mode, the DS2740 operates in a low-power mode with no current measurement activity. Serial access to current, accumulated current, and status/control registers is allowed if V > DD > 2V. The DS2740 operating mode transitions from SLEEP to ACTIVE...

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High-Precision Coulomb Counter - 6

DS2740 CURRENT RESOLUTION (1 LSB) PARTCONVERSION TIME V > IS1 - V > IS2 R > SNS 20m 15m 10m 5m DS2740U 3.515s 1.5625 V 78.13 A104.2 A 156.3 A 312.5 A DS2740BU 0.878s 6.250 V 312.5 A416.7 A 625 A 1.250mA Every 1024th conversion, the ADC measures its input offset to facilitate offset correction. Offset correction occurs approximately once per hour in the DS2740U and four times per hour in the DS2740BU. 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...

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High-Precision Coulomb Counter - 7

The DS2740 has memory space with registers for instrumentation, status, and control. When the MSB of a two-byte register is read, both the MSB and LSB are latched and held for the duration of the Read Data command to prevent updates during the read and ensure synchronization between the two register bytes. For consistent results, always read the MSB and the LSB of a two-byte register during the same Read Data command sequence. > ADDRESS (HEX) DESCRIPTION READ/WRITE 00 Reserved ї 01 Status Register R/W 02 to 07 Reserved 08 Special Feature Register R/W 09 to 0D Reserved ח 0E Current Register...

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High-Precision Coulomb Counter - 8

The format of the special feature register is shown in Figure 6. The function of each bit is described in detail in the following paragraphs. > ADDRESS 08 > h BIT 7 BIT 6 BIT 5 BIT 4BIT 3BIT 2BIT 1 BIT 0 XPIOXXXXXX > PIO PIO Pin Sense and Control. This bit is read and write enabled. Writing a 0 to the PIO bit enables the PIO open-drain output driver, forcing the PIO pin low. Writing a 1 to the PIO bit disables the output driver, allowing the PIO pin to be pulled high or used as an input. Reading the PIO bit returns the logic level forced on the PIO pin. Note that if PIO is left floating,...

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High-Precision Coulomb Counter - 10

V > PULLUP (2.0V to 5.5V) DS2740 1-Wire PORT 4.7kBUS MASTER 1 A(typ)100 TxRx RxTxRx = RECEIVE Tx = TRANSMIT MOSFET >

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High-Precision Coulomb Counter - 11

Bookof DS19xx i Button Standards > i Button is a registered trademark of Dallas Semiconductor. 11 of 16 size="-1">

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High-Precision Coulomb Counter - 12

MASTER Tx RESET PULSE DS2740 Tx PRESENCE PULSE MASTER Tx NET ADDRESSCOMMAND 33h / 39h READ 55hMATCH F0hSEARCH CChSKIP NOYESYES YES NO NO NO NO YESYES A5hRESUME NO YESNO NO NO YES DS2740 Tx FAMILY CODE 1 BYTE MASTER Tx BIT 0 DS2740 Tx BIT 0 MASTER Tx FUNCTION COMMAND RESUMEFLAG SET ? NO DS2740 Tx BIT 0 MASTER Tx BIT 0 DS2740 Tx SERIAL NUMBER 6 BYTES YES BIT 0 MATCH ? BIT 0 MATCH ? MASTER Tx FUNCTION COMMAND DS2740 Tx CRC1 BYTE MASTER Tx BIT 1 DS2740 Tx BIT 1 DS2740 Tx BIT 1 MASTER Tx BIT 1 BIT 1 MATCH ? BIT 1 MATCH ? YES NOYES YES MASTER Tx FUNCTION COMMAND MASTER Tx BIT 63 DS2740 Tx BIT 63...

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