rs5c62 RICOH Co.,Ltd., rs5c62 Datasheet - Page 43

• Manufacturer Part Number: rs5c62
• Description: Real-time Clock
• Manufacturer: RICOH Co.,Ltd.

3) Hardware
Category
Answer 1: The CS pin input can be used as it is held low, provided that the RD and WR pin inputs are
Answer 2: The CS pin input may be driven low before, during, or even after the process of addressing.
Answer 3: At power-on from 0V, the internal registers and counters have indefinite states, causing the
Answer 4: As the N-channel open drain pins, the INTR and TMOUT pins, neither of which incorporates a
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?
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?
caused to transition from their high to low to high levels to enable read and write operations,
respectively.
Addressing time (
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”.
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.)
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.
t
AS
) indicates the time required to perform the process of addressing before
Questions and Answers
RP/RF/RS5C62
39