ADP5585 Analog Devices, ADP5585 Datasheet - Page 14

• Manufacturer Part Number: ADP5585
• Description: Keypad Decoder and I/O Expansion
• Manufacturer: Analog Devices

Specifications of ADP5585

• Vin Range: 1.8 to 3.0V
• Application: Mobil I-0 Exp-Keybd Cont,Mobil I-O Expander
• Qwerty Keypad: Yes
• Other Functions: I2C I/O & register
• Function Flag: Mobil I-O
• Package: 16-Lead WLCSP

ADP5585
RESET BLOCKS
ADP5585 features two reset blocks that can generate reset con-
ditions if certain events are detected simultaneously. Up to three
reset trigger events can be programmed for RESET1. Up to two
reset trigger events can be programmed for RESET2. The event
scan control blocks monitor whether these events are present for
the duration of RESET_TRIG_TIME[2:0] (Register 0x2E,
Bits[4:2]). If they are, reset-initiate signals are sent to the reset
generator blocks. The generated reset signal pulse width is
programmable.
The Reset 1 signal uses the R4 I/O pin as its output. A pass
through mode allows the main RST pin to be output on the R4
pin also. The Reset 2 signal uses the C4 I/O pin as its output.
RESET_TRIG_TIME[2:0]
RESET1_EVENT_A[7:0]
RESET1_EVENT_B[7:0]
RESET1_EVENT_C[7:0]
RESET2_EVENT_A[7:0]
RESET2_EVENT_B[7:0]
Figure 21. Reset Blocks
RST_PASSTHRU_EN
CONTROL
CONTROL
CONTROL
BLOCK
LOGIC
SCAN
SCAN
KEY
GPI
RESET1_
RESET2_
RST
INITIATE
INITIATE
RESET_PULSE_WIDTH[1:0]
RESET
RESET
GEN 1
GEN 2
RESET1
RESET2
(R4)
(C4)
Rev. A | Page 14 of 36
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 combi-
nations and initiate a system wide reset. This alleviates the need
for removing the battery from the system and doing a hard reset.
It is not recommended to use the immediate trigger time (see
Table 54) 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 0x3C (refer
to
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 68
). Register 0x3B allows the user to choose whether
OVRFLOW_INT
OVRFLOW_IEN
EVENT_INT
EVENT_IEN
LOGIC_IEN
LOGIC_INT
GPI_INT
GPI_IEN
Figure 22. Asserting INT Low
INT_CFG
INT DRIVE
INT
Table 67
Data Sheet
).