LX1977IDU MICROSEMI [Microsemi Corporation], LX1977IDU Datasheet - Page 2

• Manufacturer Part Number: LX1977IDU
• Description: SMBus Ambient Light Sensor
• Manufacturer: MICROSEMI [Microsemi Corporation]

Copyright © 2010
Rev. 1.0, 2010-03-25
Name
SDA
ADR
SCL
R
V
INT
V
NC
R
SET
DD
SS
V
SET
DD
S I M P L I F I E D B L O C K D I A G R A M
TM
Pin #
R
ADR
Figure 1 – Simplified Block Diagram
1
2
3
4
5
6
7
8
SET
LX1977
Amplifier
Pre
Part
V
V
V
PWR
PWR
DD
DD
SS
I / O
Dir
O
I
I
I
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
SDA
SCL
INT
Sigma-
Delta
ADC
Power Supply Voltage
SMBus Data – Connect To SMBus Data Line
SMBus Clock – Connect To SMBus Clock Line
Interrupt Output Pin, Active Low, Open Drain
SMBus Address – The Address For This Device Is Determined By The State Of This Pin.
ADR = GND sets address 20H, ADR = OPEN sets address 22H, ADR=V
Gain Setting. For Gain Fine Adjustment. Typically, connect this pin to ground through a 1% 267k
resistor.
No Connection Pin
Ground Reference For Power And Signal Output
F U N C T I O N A L P I N D E S C R I P T I O N
Interface
SMBus
P R O D U C T H I G H L I G H T
µP
Analog Mixed Signal Group
®
Microsemi
V
SDA
SCL
INT
ADR
V
R
V
V
DD
SS
SET
SS
DD
4000
3000
2000
1000
0
0
SMBus Ambient Light Sensor
Description
LX1977 D
1000
P
COUNT
RODUCTION
P A C K A G E P H O T O
Figure 2 – Product Photo
2000
vs LUX @ Fosc=40.96kHz, T
Vcc = 3.3V
LUX INPUT
3000
D
ATASHEET
DD
4000
sets address 70H.
INT
=100mS
5000
0 ~ 500 lux
0 ~ 1000 lux
0 ~ 5000 lux
0 ~ 2500 lux
LX1977
6000
Page 2