ZLED7022ZI1R ZMDI, ZLED7022ZI1R Datasheet - Page 10

• Manufacturer Part Number: ZLED7022ZI1R
• Description: LED Lighting Drivers LED driver
• Manufacturer: ZMDI

Specifications of ZLED7022ZI1R

• Rohs: yes
• Input Voltage: 2.8 V to 5.5 V
• Maximum Supply Current: 1 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: uTQFN-12
• Minimum Operating Temperature: - 40 C

The current sinks [D5:D0] are controlled by the PCC serial data input on the EN/SET pin. Data is written to an internal data
register that sets the outputs to one of 14 current levels. The Vout pin provides a shared supply voltage for the LEDs. The
capacitor across the C+ and C- pins is the “pump capacitor” used by the charge pump.
2.3.
The soft-start feature protects against excessive inrush currents during the start-up of the charge pump circuit. This prevents
potential transient noise effects that can affect initial performance, especially in battery-operated applications toward the end of
the battery life.
2.4.
The ZLED7022 enters a low-current shutdown mode whenever its EN/SET input is held low longer than T
imum). In the low-current shutdown mode, the ZLED7022 draws minimal current (I
internal data register that controls output current is reset to 0, which disables the outputs.
2.5.
The ZLED7022’s Pulse Count Control (PCC) serial digital interface is used to enable/disable the LED outputs and set the
constant current level to one of 14 settings using a nearly logarithmic scale (approximately 1.5dB difference between settings)
to provide a linear brightness progression as the current level increases/decreases. See Table 2.1 for the current level
settings.
Because [D5:D0] are independent constant current sinks, the voltage at the LED output being driven is determined by the
LED’s forward voltage (V
Table 2.1
Data Sheet
November 9, 2010
ZLED7022
Low-Voltage Six-Channel LED Driver
Data Level
ZLED7022 Soft-Start Feature
ZLED7022 Low-Current Shutdown Mode
LED Current Control
10
11
12
13
14
1
2
3
4
5
6
7
8
9
Current Output Settings
© 2010 Zentrum Mikroelektronik Dresden AG - Rev. 1.0
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
F
). This enables accurate LED brightness control and matching by the control system.
Current Output per Channel (mA)
20.0
17.0
14.0
12.0
10.0
8.6
7.0
6.0
5.0
4.2
3.6
3.0
2.4
1.8
SHDN
=1μA typical, 2μA maximum) and the
OFF
10 of 15
(500μs min-