AATIAN81 Datasheet, PDF (1/4 Pages) SiGe Semiconductor, Inc. – Dual RGB Controller

EV-132
AAT4297 EVAL: Dual RGB Controller
Introduction
The AAT4297 EVAL board demonstrates the operation of the AAT4297 SmartSwitch™. This device has six
low side N-channel load switches, which are serially controlled. The AAT4297 operates from 1.8V to 5.5V,
making it ideal for use in 2.5V, 3.3V, or 5V systems, as well as systems powered by lithium-ion/polymer bat-
teries. For demonstration purposes, an AAT3110 voltage doubling charge pump has been incorporated to pro-
vide a regulated voltage source to power the system load, which is an RGB LED.
AAT4297 is controlled by an S²Cwire™ (Simple Serial Control™) interface with easy control and efficiency. The
device is enabled with the desired switch configuration after a short set of data pulses is sent to the EN/SET
input and holding the line pulled to a logic high. In the enabled state, the AAT4297 typically consumes less than
3µA of quiescent current. When EN/SET is pulled to a logic low, the device is disabled and each output switch
is placed in a high impedance open state. The switch resistance of the low side N-channel MOSFET switches
is approximately 2Ω.
This document describes the evaluation board and its accompanying user interface. In addition, a brief
“Getting Started” section is included to help the user begin operating the evaluation board. A schematic of the
complete circuit and the actual board layout are also included in the documentation. For additional informa-
tion, please consult the AAT4297 product datasheet.
Schematic
V_CC
R1 R2 R3
130 68 70
R13 R12 R11 R10 R9
1K 1K 1K 1K 1K
U3 PIC12F675
C1
1µF
0 ₂₄
SW1
135
1
2
3
4
VDD
GP5
GP4
GP3
VSS
GP0
GP1
GP2
8
7
6
5
0 ₂₄
SW2
135
0 ₂₄
SW3
135
0 ₂₄
SW4
135
0 ₂₄
SW5
135
U2
1
2
3
4
5
6
GND
OUT1
OUT2
OUT5
OUT4
OUT3
AAT4297
N/C
EN/SET
N/C
N/C
VIN
OUT6
12
11
10
9
8
7
R4 R5 R6
130 68 70
V_CC
R7
100K
C3
10µF
U1
1
2
3
4
VOUT C+
GND VIN
GND C-
GND SHDN
8
7
6
5
AAT3110
2.7V - 5V
Off On DC+
DC-
321
J1
C2
1µF
VCC
100K
R8
C4
10µF
D1 D2 D3
R G B ^{RGB 1}
D4 D5 D6
RGB 2 _{R G B}
Figure 1: Evaluation Board Schematic
EV-132.2007.01.1.0
1