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

DS2404

23 of 29

Battery Operate Mode

Figure 17 shows the necessary connections for operating the DS2404 in Battery Operate mode.

BATTERY OPERATE MODE Figure 17

VCC

Pin 1 & 16

Ground

VBATB

Pin 9

Ground

VBATO

Pin 10

2.8 to 5.5V

The VBATO pin is normally connected to any standard 3 V lithium cell or other energy source. The Battery

Operate mode also minimizes the power-consumption in applications where battery backup is not

required and the VBATO lead is directly connected to the system’s 5V supply.

NOTE:

In Battery Operate mode, the voltage on DQ must never exceed the voltage on VBATO if the 3-wire

interface is used. This restriction does not apply to the 1-Wire interface.

DEVICE OPERATION MODES

With its two ports and two power modes the DS2404 can be operated in several ways. While the

maximum voltage on the 1-Wire port (I/O) is always 6V, the maximum voltage on the 3-wire port (DQ)

depends on the power mode and actual operating voltage. A particular port is selected by setting the

control lines to a state that makes the other port inactive. See Table 1 for details.

When using the 3-wire port only and the DS2404 is wired for VCC Operate Mode (Battery Backed) the

1 Wire I/O pin can be used as counter input. This mode requires that the I/O lead is connected to VCC

through a 5k

Ω (typical) resistor. To enable communication through the 3-wire port a reset/presence

sequence has to be performed on the 1-Wire port after the system has powered up.

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