參數(shù)資料
型號(hào)： RF5C62
廠商： RICOH COMPANY LTD
元件分類： XO, clock
英文描述： REAL-TIME CLOCK
中文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO18
封裝： SOP-18
文件頁(yè)數(shù)： 43/48頁(yè)
文件大?。?/td> 419K
代理商： RF5C62
Category
Questions and Answers
3) Hardware
Question 3:At power-on from 0V, the INTR pin is driven low to output interrupts. What is the cause of
this phenomenon
Question 4:As the N-channel open drain pins, may the INTR and TMOUT pins be impressed with
higher voltage than the VDD pin
Question 1:Can the CS pin input be used as it is held low
Question 2:May the CS pin input be driven low before or during the process of addressing
Answer 4:As the N-channel open drain pins, the INTR and TMOUT pins, neither of which incorporates a
protective diode for the VDD pin, may be impressed with higher voltage than the VDD pin as
long as it does not exceed the maximum absolute rating of 12V. Their on-state resistance typi-
cally ranges from a few dozen ohms to one hundred ohms (see the graph in 10.10 of “10.
Typical Characteristics”). Their on-state current should preferably range from 10mA to 20mA
or less and must not exceed the maximum current consumption for the package.
Answer 3:At power-on from 0V, the internal registers and counters have indefinite states, causing the
INTR pin to have indefinite states as well. It is necessary, therefore, to provide temporary
masking for interrupts output from the INTR pin and initialize the internal registers and coun-
ters by following the typical software-controlled processes of initialization at power-on (see “11.
1 Initialization at Power-on”). (At power-on from 0V, when the XSTP bit is set to “1” to indicate
the start of oscillation, the TMOUT pin output is turned off.)
Answer 2:The CS pin input may be driven low before, during, or even after the process of addressing.
Addressing time (
t
AS
) indicates the time required to perform the process of addressing before
the start of read or write operation at which both the RD and CS pin inputs or both the WR and
CS pin inputs are driven low. For more details, see “1. Reading and Writing Operations” in
“USAGE”.
RP/RF/RS5C62
39
Answer 1:The CS pin input can be used as it is held low, provided that the RD and WR pin inputs are
caused to transition from their high to low to high levels to enable read and write operations,
respectively.
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