NXP PCA9685 是一款 16通道（16-channel）12位元（12-bit）PWM（脈衝寬度調變） Fm+（Fast-mode Plus） I2C-bus（I²C / Inter-Integrated Circuit）匯流排介面的 LED Controller 控制器 IC 晶片，每個 LED 輸出都有自己12位元解析度（4096級）固定頻率的獨立 PWM 控制器，PWM 控制器運行在 40Hz 到 1000Hz 範圍的頻率下，占空比（Duty Cycle）由 0 到 100% 範圍內可調，用於設置 LED 到一個確定的亮度值，所有輸出都可設置為相同的 PWM 頻率。
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| NXP PCA9685 16通道 12位元 LED 驅動 IC |
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| NXP PCA9685 16通道 12位元 LED 驅動 IC 封裝 |
NXP PCA9685
16通道 12位元 LED 驅動 IC 腳定義：
Symbol
|
TSSOP28
|
HVQFN2
|
Type
|
Description
|
A0
|
1
|
26
|
I
|
Address
input 0
|
A1
|
2
|
27
|
I
|
Address
input 1
|
A2
|
3
|
28
|
I
|
Address
input 2
|
A3
|
4
|
1
|
I
|
Address
input 3
|
A4
|
5
|
2
|
I
|
Address
input 4
|
LED0
|
6
|
3
|
O
|
LED
driver 0
|
LED1
|
7
|
4
|
O
|
LED
driver 1
|
LED2
|
8
|
5
|
O
|
LED
driver 2
|
LED3
|
9
|
6
|
O
|
LED
driver 3
|
LED4
|
10
|
7
|
O
|
LED
driver 4
|
LED5
|
11
|
8
|
O
|
LED
driver 5
|
LED6
|
12
|
9
|
O
|
LED
driver 6
|
LED7
|
13
|
10
|
O
|
LED
driver 7
|
Vss
|
14
|
11
|
Power
|
Supply
Ground
|
LED8
|
15
|
12
|
O
|
LED
driver 8
|
LED9
|
16
|
13
|
O
|
LED
driver 9
|
LED10
|
17
|
14
|
O
|
LED
driver 10
|
LED11
|
18
|
15
|
O
|
LED
driver 11
|
LED12
|
19
|
16
|
O
|
LED
driver 12
|
LED13
|
20
|
17
|
O
|
LED
driver 13
|
LED14
|
21
|
18
|
O
|
LED
driver 14
|
LED15
|
22
|
19
|
O
|
LED
driver 15
|
OE
|
23
|
20
|
I
|
Active
LOW output enable
|
A5
|
24
|
21
|
I
|
Address
input 5
|
EXTCLK
|
25
|
22
|
I
|
External
clock input
|
SCL
|
26
|
23
|
I
|
Serial
clock line
|
SDA
|
27
|
24
|
I/O
|
Serial
data line
|
Vdd
|
28
|
25
|
Power
|
Supply
voltage
|
NXP PCA9685 的技術規格特點：
◆ 16 LED drivers。Each output programmable at：
Off
On
Programmable LED brightness
Programmable LED turn-on time to help reduce EMI
◆ 1MHz Fast-mode Plus compatible I2C-bus interface with 30mA high drive capability on SDA output for driving high capacitive buses。
◆ 4096-step (12-bit) linear programmable brightness per LED output varying from fully off (default) to maximum brightness。
◆ LED output frequency (all LEDs) typically varies from 24Hz to 1526Hz (Default of 1Eh in PRE_SCALE register results in a 200Hz refresh rate with oscillator clock of 25MHz) 。
◆ Sixteen totem pole outputs (sink 25mA and source 10mA at 5V) with software programmable open-drain LED outputs selection (default at totem pole)。 No input function。
◆ Output state change programmable on the Acknowledge or the STOP Command to update outputs byte-by-byte or all at the same time (default to Change on STOP)。
◆ Active LOW Output Enable (OE) input pin。LEDn outputs programmable to logic 1，logic 0 (default at power-up) or high-impedance when OE is HIGH。
◆ 6 hardware address pins allow 62 PCA9685 devices to be connected to the same I2C-bus。
◆ Toggling OE allows for hardware LED blinking。
◆ 4 software programmable I2C-bus addresses (one LED All Call address and three LED Sub Call addresses) allow groups of devices to be addressed at the same time in any combination (for example，one register used for All Call so that all the PCA9685s on the I2C-bus can be addressed at the same time and the second register used for three different addresses so that 1/3 of all devices on the bus can be addressed at the same time in a group). Software enable and disable for these I2C-bus address。
◆ Software Reset feature (SWRST General Call) allows the device to be reset through the I2C-bus。
◆ 25MHz typical internal oscillator requires no external components。
◆ External 50MHz (max.) clock input。
◆ Internal power-on reset。
◆ Noise filter on SDA/SCL inputs。
◆ Edge rate control on outputs。
◆ No output glitches on power-up。
◆ Supports hot insertion。
◆ Low standby current。
◆ Operating power supply voltage range of 2.3V to 5.5V。
◆ 5.5V tolerant inputs。
◆ 40℃ to +85℃ operation。
◆ ESD protection exceeds 2000V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000V CDM per JESD22-C101。
◆ Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100mA。
◆ Packages offered：TSSOP28，HVQFN28。
2016年 10月 20日 天氣報告
氣溫：28.9度 @ 20:30
相對濕度：百分之 73%
天氣：大致多雲※ 天文台在下午 8時 40分發出三號熱帶氣旋警告信號。強颱風海馬的位置為北緯19.8 度，東經 117.6度附近，接近中心最高持續風速為每小時 155公里。
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