Rainbow-electronics DS2784 Manual de usuario Pagina 1

1 of 38 REV: 092507 GENERAL DESCRIPTION The DS2784 operates from 2.5V to 4.6V for integration in battery packs using a single lithium-i

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication DS2784 shuts off both external FETs and sets the COC flag in the

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 11 of 38 a 1 to bits 4 to 7 has no effect on the register. Bi

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 12 of 38 Table 2. VOV Threshold VOV BIT FIELD VOVVOV BIT FIE

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 13 of 38 TEMPERATURE MEASUREMENT The DS2784 uses an integrate

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 14 of 38 measurement made just prior to the offset conversion

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 15 of 38 CURRENT MEASUREMENT CALIBRATION The DS2784’s current

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 16 of 38 Read and write access is allowed to the ACR. The ACR

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication CAPACITY ESTIMATION ALGORITHM Remaining capacity estimation uses

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication Figure 3. Cell Model Example Diagram 18 of 38 ull—The full

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication model curve are stored in the cell parameter EEPROM block as ppm

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 2 of 38 ABSOLUTE MAXIMUM RATINGS Voltage Range on PLS Pin Rel

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 20 of 38 charge current threshold used to detect a fully cha

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 21 of 38 he ACR value is adjusted occasionally to maintain th

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 22 of 38

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 23 of 38 LEARNF—Learn Flag. LEARNF indicates that the current

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 24 of 38 MSB—ADDRESS 02h LSB—ADDRESS 03h 21521421321

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 25 of 38 Calculation of Results RAAC [mAh] = (ACR[mVh] - AE(

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication BL1—Parameter EEPROM Block 1 Lock Flag. A 1 in this read-only bi

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 27 of 38 Table 7. Parameter EEPROM Memory Block ADDRESS (HE

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 28 of 38 Table 8. Memory Map ADDRESS (HEX) DESCRIPTION READ/

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 29 of 38 AUTHENTICATION Authentication is performed using a F

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 3 of 38 PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DQ, P

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication SECRET MANAGEMENT FUNCTION COMMANDS CLEAR SECRET [5Ah]. This co

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication CRC GENERATION The DS2784 has an 8-bit CRC stored in the most si

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication The 1-Wire bus must have a pullup resistor at the bus-master end

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 33 of 38 Search Net Address [F0h]. This command allows the bu

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 34 of 38 Table 11. All Function Commands COMMAND HEX DESCRIP

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication Table 12. Guide to Function Command Requirements COMMAND ISSUE M

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication Figure 10. Compute Next Secret Function Command Figure 11. Co

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication I/O SIGNALING The 1-Wire bus requires strict signaling protocols

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication Figure 14. 1-Wire Write and Read-Time Slots PACKAGE INFORMATI

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 4 of 38 EEPROM RELIABILITY SPECIFICATION (VDD = 2.5V to 5.5V,

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication TYPICAL OPERATING CIRCUIT PIN DESCRIPTION PIN NAME FUNCTION

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication DETAILED DESCRIPTION The DS2784 functions as an accurate fuel ga

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 7 of 38 POWER MODES The DS2784 has two power modes: Active an

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication PMOD = 0UVEN = 0PMOD = 1UVEN = 1PMOD = 1UVEN = 0PMOD = 0UVEN =

DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication 9 of 38 RNAOP—Read Net Address Op Code. A value of 0 selects