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參數(shù)資料
| 型號(hào)： | ADP5587CP-EVALZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 3/24頁 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR ADP5587 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，GPIO 擴(kuò)展器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADP5587 |
| 主要屬性： | 8 位 18 端口 GPIO 擴(kuò)展器 |
| 次要屬性： | I²C 接口 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | ADP5587ACBZ-R7DKR-ND - IC I/O EXPANDER/KEYBRD CTRLR ADP5587ACBZ-R7CT-ND - IC I/O EXPANDER/KEYBRD CTRLR ADP5587ACBZ-R7TR-ND - IC I/O EXPANDER/KEYBRD CTRLR ADP5587ACPZ-R7DKR-ND - IC EXPANDER/KEYBOARD CTRLR ADP5587ACPZ-R7CT-ND - IC EXPANDER/KEYBOARD CTRLR ADP5587ACPZ-R7TR-ND - IC EXPANDER/KEYBOARD CTRLR |
Data Sheet
ADP5587
Rev. D | Page 11 of 24
Keypad Lock/Unlock Feature
The ADP5587 has a locking feature that allows the user to lock
the keypad or GPIs (configured to be part of the event table).
When enabled, the keypad lock can prevent generation of key
event interrupts and prevent key events from being recorded
in the key event table. This feature comprises the Unlock Key 1
and Unlock Key 2 registers (Register 0x0F and Register 0x10,
respectively), the keypad lock interrupt mask and keypad
unlock timers (Register 0x0E), and the LCK1, LCK2, and
keylock enable (K_LCK_EN) bits (Register 0x03).
The unlock keys can be programmed with any value of the keys
in the keypad matrix or any GPI event values that are part of the
key event table. When the keypad lock interrupt mask timer is
enabled, the user must press two specific keys before a keylock
interrupt is generated or keypad events are recorded. After the
keypad is locked (set Bit 6, Register 0x03, to enable the lock),
the first time that the user presses any key, a key event interrupt
is generated. No additional interrupt is generated unless both
unlock key sequences are correct.
If the correct unlock keys are not pressed before the mask timer
expires, the state machine starts over. The first key event inter-
rupt is generated to allow the software to see that the user has
pressed a key so that the host can turn on the LCD and display
the unlock message. The host then reads the lock status register
to see if the keypad is unlocked. After the first key event
interrupt, the state machine does not interrupt the processor
again unless the correct sequence is keyed. The state machine is
reset if the correct sequences are not keyed before the keypad
lock interrupt mask timer expires.
The state of the keypad lock interrupt mask bit (Register 0x01,
Bit 2) in the configuration register determines whether the
interrupt pin is asserted when the keylock interrupt status bit
(Register 0x02, Bit 2) is set. Setting the keylock interrupt mask
bit causes the INT pin to be asserted when the keylock interrupt
status bit is set in Register 0x02; clearing that bit masks the
interrupt, causing the interrupt pin not to respond to the keylock
interrupt status bit. The mask interrupt timer should be set for
the time that it takes for the LCD to dim or turn off so that, if a
key is pressed, the backlight is set to bright mode again or reset
to turn on the LCD.
When the unlock mask interrupt timer equals 0, only the
correct unlock sequence can generate an interrupt. Disabling
the unlock mask interrupt timer allows the processor to remain
undisturbed for situations in which the user, for example, has
the phone in a pocket or purse and the keys are constantly
pressed. The flowchart in Figure 11 shows the interaction of
interrupt enable, key event counter, key event interrupt status,
and interrupt generation.
KEY EVENT INTERRUPT
KEYLOCK INTERRUPT
OVERFLOW INTERRUPT
GPIO INTERRUPT
INT
OR
INTERRUPT CONFIGURATION
OVR_FLOW_
IEN
K_LCK_IM GPI_IEN KE_IEN
GPIEM_
CFG
KEYPAD LOCK INTERRUPT MASK TIMER
K_LCK_EN
INT
LOGIC
VCC
08612-
009
Figure 13. INT Pin Drive
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADP5588 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Keypad I/O Expander |
| ADP5588ACPZ-R7 | 功能描述:IC KEYPAD SCANNER GPIO PORT EXP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 特色產(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
| ADP5588ACPZ-R7B2 | 功能描述:Keypads and Alarm Systems Interface 24-LFCSP-WQ (4x4) 制造商:analog devices inc. 系列:- 包裝:帶卷（TR） 零件狀態(tài):上次購買時(shí)間 應(yīng)用:鍵盤和警報(bào)系統(tǒng) 接口:I2C 電壓 - 電源:1.8 V ~ 3 V 封裝/外殼:24-WFQFN 裸露焊盤，CSP 供應(yīng)商器件封裝:24-LFCSP-WQ（4x4） 安裝類型:表面貼裝 標(biāo)準(zhǔn)包裝:1 |
| ADP5588-EVALZ | 功能描述:BOARD EVAL ADP5588 KEYPAD/GPIO RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
| ADP5588XCPZ-R7 | 功能描述:Keypads and Alarm Systems Interface 制造商:analog devices inc. 系列:- 包裝:- 零件狀態(tài):上次購買時(shí)間 應(yīng)用:鍵盤和警報(bào)系統(tǒng) 接口:I2C 電壓 - 電源:1.8 V ~ 3 V 封裝/外殼:- 供應(yīng)商器件封裝:- 安裝類型:- 標(biāo)準(zhǔn)包裝:1 |
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