DS2404B【PDF 15/29 页】IC ECONORAM TIMECHIP 5.5V 16SSOP

DS2404

22 of 29

VCC Operate Mode (Battery-Backed)

Figure 16 shows the necessary connections for operating the DS2404 in VCC Operate mode.

VCC OPERATE MODE Figure 16

VCC

Pin 1 & 16

2.8V to 5.5V

VBATB

Pin 9

2.8V to 5.5V

VBATO

Pin 10

must be unconnected

To always allow communication through the 1-Wire or wire port, the voltage on VCC must be

approximately 3-wire port, the voltage on VCC must be approximately 0.2V above the voltage on VBATB.

Otherwise the DS2404 will retain data, but will not allow any access.

The VBATB pin is normally connected to any standard 3V lithium cell or other energy source. As VCC falls

below VBATB, the power switching circuit allows VBATB to provide energy for maintaining clock

functionality and data retention. No communication can take place while VBATB is greater than VCC.

During power-up, when VCC reaches a value of approximately 0.2V above VBATB, the power switching

circuit connects VCC and disconnects VBATB. If the oscillator is on, no communication can take place until

VCC has stayed approximately 0.2V above VBATB for 123 ± 2ms. During power-down, the falling VCC

must pass the range from VBATB to 0V in no less than 100ns for the power switching circuit to function

properly.

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