Rainbow Electronics DS1602 - Manual (Page 4)

DS1602
4 of 8
Dallas Real-Time Clocks. The DS1602 can also be driven by an external 32.768kHz oscillator. In this
configuration, the X1 pin is connected to the external oscillator signal and the X2 pin is floated.
V
BAT
– Battery input for any standard 3V lithium cell or other energy source. Battery voltage must be
held between 2.5V and 3.5V for proper operation. The nominal write-protect trip-point voltage at which
access to the DS1602 is denied is set by the internal circuitry as 1.25 x V
BAT
nominal. UL recognized to
ensure against reverse charging current when used in conjunction with a lithium battery. See “Conditions
of Acceptability” at
www.maxim- ic.com/TechSupport/QA/ntrl.htm .
Figure 1. ELAPSED TIME COUNTER BLOCK DIAGRAM
Figure 2. PROTOCOL BIT MAP
7 6 5 4 3 2 1 0
ACC AVC OSC2 OSC1 OSC0 CCC CVC RD