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CAT3626HS4-T2 Datasheet(PDF) 8 Page - Catalyst Semiconductor |
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CAT3626HS4-T2 Datasheet(HTML) 8 Page - Catalyst Semiconductor |
8 / 14 page CAT3626 Doc. No. 5014 Rev. A 8 © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice PIN DESCRIPTIONS Pin # Name Function 1 LEDA1 Cathode terminal of LED A1 2 SDA I 2C Serial data input/output 3 SCL I 2C Serial clock input 4 EN Enable input 5 VOUT Charge pump output connected to the LED anodes 6 VIN Supply voltage 7 C1- Bucket capacitor 1 terminal 8 C1+ Bucket capacitor 1 terminal 9 C2- Bucket capacitor 2 terminal 10 C2+ Bucket capacitor 2 terminal 11 GND Ground reference 12 LEDC2 Cathode terminal of LED C2 13 LEDC1 Cathode terminal of LED C1 14 LEDB2 Cathode terminal of LED B2 15 LEDB1 Cathode terminal of LED B1 16 LEDA2 Cathode terminal of LED A2 TAB Connect to Ground on PCB PIN FUNCTION VIN is the supply pin for the charge pump. A small 1µF ceramic bypass capacitor is required between the VIN pin and ground near the device. The operating input voltage range is from 2.2V to 5.5V. Whenever the input supply falls below the undervoltage threshold (2V), all LEDs channels will be automatically disabled. EN is the enable logic input for the driver. Guaranteed levels of logic high and logic low are set at 1.3V and 0.4V respectively. When EN is initially taken high, the device becomes enabled and all LED currents remain at 0mA. To place the device into zero current shutdown mode, the EN pin must be held low. SDA is the I 2C serial data line. This is a bidirectional line allowing data to be written into and read from the four registers in the driver. Registers RegA/B/C set the LED current in each pair of channels, while RegEn sets the On/Off state independently of each channel. SCL is the I 2C serial clock input. VOUT is the charge pump output that is connected to the LED anodes. A small 1µF ceramic bypass capacitor is required between the VOUT pin and ground near the device. GND is the ground reference for the charge pump. The pin must be connected to the ground plane on the PCB. C1+, C1- are connected to each side of the 1µF ceramic bucket capacitor C1. C2+, C2- are connected to each side of the 1µF ceramic bucket capacitor C2. LEDxx provide the internally regulated current to the six LED cathodes. These pins enter a high-impedance zero-current state whenever the device is placed in shutdown mode. In applications using less than six LEDs, the unused channels should be disabled through the RegEn register. TAB is the exposed pad underneath the package. For best thermal performance, the tab should be soldered to the PCB and connected to the ground plane. |
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