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Data Sheet ADP5589
Rev. B | Page 13 of 52
When full unlock is achieved, FIFO and event count updates
resume. Note that if a key press is used as the second unlock
event, the release of that key is captured on the FIFO after
unlocking is completed.
The ADP5589 features an unlock timer, UNLOCK_TIMER[2:0]
(0x36[2:0]). When enabled, after the first unlock event occurs,
the unlock timer begins counting, and the second unlock event
must occur before the unlock timer expires. If the unlock timer
expires, the first unlock event must occur again to restart the
unlock process. Figure 15 shows a simple state diagram of the
unlocking process.
NO
FIRST
UNLOCK
EVENT?
UNLOCK
TIMER
ENABLED?
SECOND
UNLOCK EVENT
REQUIRED?
START UNLOCK TIMER
UNLOCK
TIMER
EXPIRED?
UNLOCK
YES
NO
YES
SECOND
UNLOCK EVENT?
NO
YES
YES
LOCKED
NO
NO
YES
YES
LOCK_STAT = 0
LOCK_STAT = 1
LOCK_STAT = 1
EVENT
DETECTED?
YES
NO
EVENT
DETECTED?
YES
NO
EVENT
DETECTED?
NO
09714-014
Figure 15. State Diagram of Unlocking Process
When lock mode is enabled, no EVENT_INT interrupts can be
generated until the unlock events occur.
The ADP5589 features an interrupt mask timer, INT_MASK_
TIMER[4:0] (0x36[7:3]). When this timer and lock mode are
enabled, a single EVENT_INT is generated if any key is pressed
or any GPI (programmed to update the FIFO) is active. When
the EVENT_INT is generated, the mask timer begins counting.
No additional EVENT_INT interrupts are generated until
the mask timer expires and a new key is pressed or any GPI
(programmed to update the FIFO) is active, unless the unlock
events occur, in which case, normal operation is resumed.
Allowing a single EVENT_INT interrupt is useful to alert the
processor to turn on its screen and display an unlock message
to the user. Blanking out additional key presses ensures that the
processor is not unnecessarily interrupted until the unlock
events occur. Figure 16 shows the unlock sequence when the
interrupt mask timer is enabled.
- ADP5589 1
- TABLE OF CONTENTS 2
- SPECIFICATIONS 3
- ABSOLUTE MAXIMUM RATINGS 5
- QUICK DEVICE OVERVIEW 7
- 9714-004 7
- DEVICE ENABLE 8
- DEVICE OVERVIEW 8
- EVENT FIFO 9
- KEY SCAN CONTROL 9
- Rev. B 10
- KEY PRESSED 10
- 09714-009 10
- Data Sheet ADP5589 11
- ADP5589 Data Sheet 12
- Key Pad Extension 12
- Ghosting 12
- FIFO Lock/Unlock 12
- GPI Input 15
- REGISTER INTERFACE 19
- REGISTER MAP 21
- ID Register 0x00 23
- INT_STATUS Register 0x01 23
- Status Register 0x02 23
- FIFO_1 Register 0x03 24
- Rev. B 25
- Rev. B 26
- GPI_INT_STAT_A Register 0x13 27
- GPI_INT_STAT_B Register 0x14 27
- GPI_INT_STAT_C Register 0x15 27
- GPI_STATUS_A Register 0x16 28
- GPI_STATUS_B Register 0x17 28
- GPI_STATUS_C Register 0x18 28
- RPULL_CONFIG_A Register 0x19 29
- RPULL_CONFIG_B Register 0x1A 29
- RPULL_CONFIG_C Register 0x1B 30
- RPULL_CONFIG_D Register 0x1C 30
- RPULL_CONFIG_E Register 0x1D 31
- GPI_EVENT_EN_A Register 0x21 32
- GPI_EVENT_EN_B Register 0x22 33
- GPI_EVENT_EN_C Register 0x23 33
- DEBOUNCE_DIS_A Register 0x27 35
- DEBOUNCE_DIS_B Register 0x28 35
- DEBOUNCE_DIS_C Register 0x29 36
- GPO_DATA_OUT_A Register 0x2A 36
- GPO_DATA_OUT_B Register 0x2B 36
- GPO_DATA_OUT_C Register 0x2C 37
- GPO_OUT_MODE_A Register 0x2D 37
- GPO_OUT_MODE_B Register 0x2E 37
- GPO_OUT_MODE_C Register 0x2F 38
- UNLOCK1 Register 0x33 39
- UNLOCK2 Register 0x34 39
- EXT_LOCK_EVENT Register 0x35 39
- UNLOCK_TIMERS Register 0x36 40
- LOCK_CFG Register 0x37 40
- RESET1_EVENT_A Register 0x38 40
- RESET1_EVENT_B Register 0x39 40
- RESET1_EVENT_C Register 0x3A 41
- RESET2_EVENT_A Register 0x3B 41
- RESET2_EVENT_B Register 0x3C 41
- RESET_CFG Register 0x3D 41
- PWM_OFFT_LOW Register 0x3E 42
- PWM_OFFT_HIGH Register 0x3F 42
- PWM_ONT_LOW Register 0x40 42
- PWM_ONT_HIGH Register 0x41 42
- PWM_CFG Register 0x42 42
- CLOCK_DIV_CFG Register 0x43 43
- LOGIC_1_CFG Register 0x44 43
- LOGIC_2_CFG Register 0x45 43
- LOGIC_FF_CFG Register 0x46 44
- POLL_TIME_CFG Register 0x48 44
- PIN_CONFIG_A Register 0x49 45
- PIN_CONFIG_B Register 0x4A 45
- PIN_CONFIG_C Register 0x4B 45
- PIN_CONFIG_D Register 0x4C 46
- GENERAL_CFG_B Register 0x4D 46
- INT_EN Register 0x4E 47
- APPLICATION DIAGRAM 48
- OUTLINE DIMENSIONS 49
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