DS1925 datasheet(4/46 Pages) MAXIM

4 / 46 page

(VPUP = 3.0V to 5.25V, unless otherwise noted.)

Note 10: The I-V characteristic is linear for voltages less than 1V.

Note 11: The earliest recognition of a negative edge is possible at tREH after VTH has been previously reached.

Note 12: ε in Figure 13 represents the time required for the pullup circuitry to pull the voltage on IO up from VIL to VTH.

Note 13: δ in Figure 13 represents the time required for the pullup circuitry to pull the voltage on IO up from VIL to the input-high

threshold of the bus master.

Note 14: This number was derived from a test conducted by Cemagref Antony, France, in July 2000 (Cemagref Test Report No. E42).

Note 15: Maxim data-logger products are 100% tested and calibrated at time of manufacture to ensure that they meet all data sheet

parameters, including temperature accuracy. As with any sensor-based product, user shall be responsible for occasionally

rechecking the temperature accuracy of the product to ensure it is still operating properly. Furthermore, as with all products

of this type, when deployed in the field and subjected to handling, harsh environments, or other hazards/use conditions,

there may be some extremely small but nonzero logger failure rate. In applications where the failure of any logger is a con-

cern, user shall assure that redundant (or other primary) methods of testing and determining the handling methods, quality,

and fitness of the articles and products are implemented to further mitigate any risk.

Note 16: Any DS1925 device that is in an unknown state should be assumed to require the additional delay of tSRTC as if it were in

the Clear Memory state. Failure to do so may cause the device to experience a power-on-reset or battery-fail event, setting

the BOR alarm flag and disabling device features.

DS1925

iButton High-Capacity Temperature Logger

with 122KB Data-Log Memory

www.maximintegrated.com

Maxim Integrated │ 4

iButton Can Physical Specification

Electrical Characteristics (continued)

SIZE

See the Package Information section.

WEIGHT

Ca. 3.3 grams

DS1925 датащи(PDF) 4 Page - Maxim Integrated Products