PCA9622：I2C控制的16位RGB LED驱动器，详解电压调光与 PWM 控制功能

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PCA9622是一款专为I2C总线设计的16位LED驱动器，其核心特性是针对RGB/RGBA（红、绿、蓝和琥珀色）LED的电压开关调光和闪烁控制。该芯片每个LED输出通道都配备了一个独立的8位分辨率（256级）PWM控制器，工作频率固定为97kHz，可以调整占空比，从0%到99.6%，使得LED可以设置到特定的亮度级别。此外，还有一个额外的8位分辨率群组PWM控制器，具有固定频率190Hz和可调频率范围，从24Hz到每10.73秒一次，同样支持0%到99.6%的占空比调整，用于同步调节所有LED的亮度或进行闪烁。每个LED输出可以单独控制，关闭、开启（无PWM控制）、设置为个体PWM值，或者同时使用个体和群组PWM控制器。PCA9622工作在宽广的电压范围内，即2.3V至5.5V，100mA的开漏输出允许最高40V的电压驱动，这使得它在高效率和高电流应用中表现出色。值得注意的是，PCA9622属于Fast-mode Plus (Fm+)设备系列的一部分，这种新型系列提供更高的工作频率，高达1MHz，以及更密集的总线操作能力，最多支持4000pF的电容负载，这意味着它可以处理更快的数据传输，减少通信延迟。其设计中包含一个活跃低输出使能信号，这有助于控制何时启用或禁用LED输出，从而实现精确的控制和节能。此外，PCA9622的紧凑型封装（如SOT-23或TSSOP）使其非常适合空间受限的应用场景，例如小型电子设备和嵌入式系统。 PCA9622是一款高度灵活且高效的LED驱动器，适合那些需要精细控制多色LED照明的应用，尤其是在对速度、功耗和集成度有较高要求的现代电子产品中。通过I2C接口的便捷性，设计师可以轻松集成和管理多个LED，简化了系统设计和扩展性。

Product data sheet Rev. 03 — 31 August 2009 7 of 39

NXP Semiconductors

PCA9622

16-bit Fm+ I

C-bus 100 mA 40 V LED driver

7. Functional description

Refer to Figure 1 “Block diagram of PCA9622”.

7.1 Device addresses

Following a START condition, the bus master must output the address of the slave it is

accessing.

There are a maximum of 128 possible programmable addresses using the 7 hardware

address pins. Two of these addresses, Software Reset and LED All Call, cannot be used

because their default power-up state is ON, leaving a maximum of 126 addresses. Using

other reserved addresses, as well as any other Sub Call address, will reduce the total

number of possible addresses even further.

7.1.1 Regular I

C-bus slave address

The I

C-bus slave address of the PCA9622 is shown in Figure 4. To conserve power, no

internal pull-up resistors are incorporated on the hardware selectable address pins and

they must be pulled HIGH or LOW.

Remark: Using reserved I

C-bus addresses will interfere with other devices, but only if the

devices are on the bus and/or the bus will be open to other I

C-bus systems at some later

date. In a closed system where the designer controls the address assignment these

addresses can be used since the PCA9622 treats them like any other address. The

LED All Call, Software Rest and PCA9564 or PCA9665 slave address (if on the bus) can

never be used for individual device addresses.

• PCA9622 LED All Call address (1110 000) and Software Reset (0000 0110) which

are active on start-up

• PCA9564 (0000 000) or PCA9665 (1110 000) slave address which is active on

start-up

• ‘reserved for future use’ I

C-bus addresses (0000 011, 1111 1XX)

• slave devices that use the 10-bit addressing scheme (1111 0XX)

• slave devices that are designed to respond to the General Call address (0000 000)

• High-speed mode (Hs-mode) master code (0000 1XX)

The last bit of the address byte deﬁnes the operation to be performed. When set to logic 1

a read is selected, while a logic 0 selects a write operation.

Fig 4. Slave address

R/W

002aab319

A6 A5 A4 A3 A2 A1 A0

hardware selectable

slave address

Product data sheet Rev. 03 — 31 August 2009 8 of 39

NXP Semiconductors

PCA9622

16-bit Fm+ I

C-bus 100 mA 40 V LED driver

7.1.2 LED All Call I

C-bus address

• Default power-up value (ALLCALLADR register): E0h or 1110 000

• Programmable through I

C-bus (volatile programming)

• At power-up, LED All Call I

C-bus address is enabled. PCA9622 sends an ACK when

E0h (R/W = 0) or E1h (R/W = 1) is sent by the master.

See Section 7.3.8 “ALLCALLADR, LED All Call I

C-bus address” for more detail.

Remark: The default LED All Call I

C-bus address (E0h or 1110 000) must not be used

as a regular I

C-bus slave address since this address is enabled at power-up. All the

PCA9622s on the I

C-bus will acknowledge the address if sent by the I

C-bus master.

7.1.3 LED Sub Call I

C-bus addresses

• 3 different I

C-bus addresses can be used

• Default power-up values:

– SUBADR1 register: E2h or 1110 001

– SUBADR2 register: E4h or 1110 010

– SUBADR3 register: E8h or 1110 100

• Programmable through I

C-bus (volatile programming)

• At power-up, Sub Call I

C-bus addresses are disabled. PCA9622 does not send an

ACK when E2h (R/W = 0) or E3h (R/W = 1), E4h (R/W = 0) or E5h (R/W = 1), or

E8h (R/W = 0) or E9h (R/W = 1) is sent by the master.

See Section 7.3.7 “SUBADR1 to SUBADR3, I

C-bus subaddress 1 to 3” for more detail.

Remark: The default LED Sub Call I

C-bus addresses may be used as regular I

C-bus

slave addresses as long as they are disabled.

7.1.4 Software Reset I

C-bus address

The address shown in Figure 5 is used when a reset of the PCA9622 needs to be

performed by the master. The Software Reset address (SWRST Call) must be used with

R/W = logic 0. If R/W = logic 1, the PCA9622 does not acknowledge the SWRST. See

Section 7.6 “Software reset” for more detail.

Remark: The Software Reset I

C-bus address is a reserved address and cannot be used

as a regular I

C-bus slave address or as an LED All Call or LED Sub Call address.

Fig 5. Software Reset address

002aab416

0 0 0 0 0 1 1

R/W

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