Rainbow-electronics MAX847 Manual de usuario

________________General DescriptionThe MAX847 is a complete power-supply and monitor-ing system for two-way pagers or other low-power digi-tal communi

MAX847OUT can be set as low as 1.8V; however, some runmode functions are limited when VOUTis below 2.5V:• The allowed serial-interface clock rate is r

The comparison threshold voltages for each channelare described in the following equations:VTH(CH0: pin 9) = D · 10mVVTH(CH1: NICD) = D · 40mVVTH(CH2:

MAX847pulse width modulation (PWM), as well as synchroniza-tion, to minimize noise. Some MAX847 functions are confined to Run Modewhile others remain

Backup Linear RegulatorThe BACKUP serial input bit turns on the backup regu-lator, which sources current from NICD to OUT. Thisregulator backs up OUT

MAX847Serial data is clocked in and out MSB first. Input data islatched on the CLK rising edge, and output data isshifted out on the CLK falling edge.

lation of programming etiquette (R1 and R0 are some-times address bits and other times data bits) allows theCH DAC to be loaded with only one write op

MAX8471-Cell, Step-Up Two-Way Pager System IC16 ______________________________________________________________________________________To minimize batt

MAX8471-Cell, Step-Up Two-Way Pager System IC______________________________________________________________________________________ 17QSOP.EPSPackage

MAX8471-Cell, Step-Up Two-Way Pager System IC18 ______________________________________________________________________________________NOTES

MAX8471-Cell, Step-Up Two-Way Pager System IC2 _______________________________________________________________________________________ABSOLUTE MAXIMUM

MAX8471-Cell, Step-Up Two-Way Pager System IC_______________________________________________________________________________________ 3ELECTRICAL CHARA

MAX8471-Cell, Step-Up Two-Way Pager System IC4 _______________________________________________________________________________________ELECTRICAL CHARA

MAX8471-Cell, Step-Up Two-Way Pager System IC_______________________________________________________________________________________ 5ELECTRICAL CHARA

MAX8471-Cell, Step-Up Two-Way Pager System IC6 _______________________________________________________________________________________Typical Operatin

MAX8471-Cell, Step-Up Two-Way Pager System IC_______________________________________________________________________________________ 7________________

MAX8471-Cell, Step-Up Two-Way Pager System IC8 _______________________________________________________________________________________LBOLBICH00.6VCH0

______________ Detailed DescriptionThe MAX847 contains several functional blocks thatsimplify the integration of power-supply and monitoringfunctions