ADP5585 Analog Devices, ADP5585 Datasheet - Page 12

• 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
GPI INPUT
Each of the 10 input/output lines can be configured as a
general-purpose logic input line. Figure 15 shows a detailed
representation of the GPI scan and detect block and its
associated control and status signals.
The current input state of each GPI can be read back using the
GPI_STATUS_x registers. Each GPI can be programmed to
generate an interrupt via the GPI_INTERRUPT_EN_x registers.
The interrupt status is stored in the GPI_INT_STAT_x registers.
GPI interrupts can be programmed to trigger on the positive or
negative edge by configuring the GPI_INT_LEVEL_x registers.
If any of the GPI interrupts is triggered, the master GPI_INT
interrupt is also triggered. Figure 16 shows a single GPI and
how it affects its corresponding status and interrupt status bits.
GPIs can be programmed to generate FIFO events via the
GPI_EVENT_EN_x registers. GPIs in this mode do not generate
GPI_INT interrupts and instead generate EVENT_INT interrupts.
Figure 17 shows several GPI lines and their effects on the FIFO
and event count, EC[4:0].
GPI_INTERRUPT_EN_A[3]
GPI_INTERRUPT_EN_A[7:0]
GPI_INTERRUPT_EN_B[7:0]
GPIO_DIRECTION_A[7:0]
GPIO_DIRECTION_B[7:0]
GPI_INT_LEVEL_A[3]
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]
GPI_INT_LEVEL_A[7:0]
GPI_INT_LEVEL_B[7:0]
GPI_EVENT_EN_A[7:0]
GPI_EVENT_EN_B[7:0]
GPI_INT_STAT_A[3]
GPI_STATUS_A[3]
PIN_CONFIG_A[7:0]
PIN_CONFIG_B[7:0]
RST/(R5)
(R0)
(R1)
(R2)
(R3)
(R4)
(C0)
(C1)
(C2)
(C3)
(C4)
GPI_INT
GPIO 10
GPI 3
GPIO 11
GPIO 1
GPIO 2
GPIO 3
GPIO 4
GPIO 5
GPIO 6
GPIO 7
GPIO 8
GPIO 9
Figure 15. GPI Scan and Detect Block
Figure 16. Single GPI Example
GPI SCAN
CONTROL
LOGIC EVENT
KEY EVENT
GPI EVENT
I
2
C BUSY
EVENT_INT
GPI_INT
GPI_INT_STAT_A[5:0]
GPI_INT_STAT_B[4:0]
GPI_STATUS_A[5:0]
GPI_STATUS_B[4:0]
CLEARED
BY READ
UPDATE
FIFO
CLEARED
BY WRITE ‘1’
OVRFLOW_INT
FIFO1:FIFO16
EC[4:0]
Rev. A | Page 12 of 36
The GPI scanner is idle until it detects a level transition. It scans
the GPI inputs and updates accordingly. It then returns to idle
immediately, it does not scan/wait, like the key scanner. As
such, the GPI scanner can detect narrow pulses once they get
past the 50 μs input debounce filter.
GPO OUTPUT
Each of the 10 input/output lines can be configured as a general-
purpose output (GPO) line. Figure 6 shows a detailed diagram
of the I/O structure. See the Detailed Register Descriptions
section for GPO configuration and usage.
LOGIC BLOCKS
Several of the ADP5585 input/output lines can be used as inputs
and outputs for implementing some common logic functions.
The R1, R2, and R3 input/output pins can be used as inputs,
and the R0 input/output pin can be used as an output for the
logic block.
The outputs from the logic blocks can be configured to generate
interrupts. They can also be configured to generate events on
the FIFO.
Figure 19 shows a detailed diagram of the internal make-up of
the logic block, illustrating the possible logic functions that can
be implemented.
GPI SCAN
EVENT_INT
EC[4:0]
GPI 7
GPI 4
GPI 2
GPI 4 INACTIVE
GPI 7 INACTIVE
GPI 2 INACTIVE
GPI 2 ACTIVE
GPI 7 ACTIVE
GPI 4 ACTIVE
1
1
1
0
0
0
FIFO
1
38
43
40
40
43
38
Figure 17. Multiple GPI Example
2
3
4
Data Sheet
5
6