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ADP5589CP-EVALZ Datasheet(PDF) 18 Page - Analog Devices

Part No. ADP5589CP-EVALZ
Description  Keypad Decoder and I/O Expansion
Download  52 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP5589CP-EVALZ Datasheet(HTML) 18 Page - Analog Devices

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ADP5589
Data Sheet
Rev. B | Page 18 of 52
RESET_PULSE_WIDTH[1:0]
RESET_TRIGGER_TIME[2:0]
RESET1_EVENT_A[7:0]
RESET1_EVENT_B[7:0]
RESET1_EVENT_C[7:0]
KEY
SCAN
CONTROL
RST_PASSTHRU_EN
RST
(R4)
RESET1
GPI
SCAN
CONTROL
LOGIC
BLOCK
CONTROL
RESET2_EVENT_A[7:0]
RESET2_EVENT_B[7:0]
(C4)
RESET2
RESET1_
INITIATE
RESET2_
INITIATE
RESET
GEN 2
RESET
GEN 1
Figure 25. Reset Blocks
The RESET1 signal uses I/O Pin R4 as its output. A pass-
through mode allows the main RST pin to be output on the
R4 pin also.
The RESET2 signal uses I/O Pin C4 as its output.
The reset generation signals are useful in situations where the
system processor has locked up and the system is unresponsive
to input events. The user can press one of the reset event combina-
tions and initiate a system-wide reset. This alleviates the need
for removing the battery from the system and performing a
hard reset.
It is not recommended to use the immediate trigger time (see
the details of the RESET_CFG Register, 0x3D, in Table 69)
because this setting may cause false triggering.
INTERRUPTS
The INT pin can be asserted low if any of the internal interrupt
sources is active. The user can select which internal interrupts
interact with the external interrupt pin in register INT_EN
(Address 0x4E, Bits[7:0]) (refer to Table 86). allows the user to
choose whether the external interrupt pin remains asserted, or
deasserts for 50 µs, then reasserts, in the case that there are
multiple internal interrupts asserted, and one is cleared (refer
to Table 85).
EVENT_INT
EVENT_IEN
INT DRIVE
INT
INT_CFG
GPI_INT
GPI_IEN
LOGIC1_INT
LOGIC2_INT
LOGIC1_IEN
LOGIC2_IEN
OVRFLOW_INT
OVRFLOW_IEN
LOCK_INT
LOCK_IEN
Figure 26. Asserting INT Low


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