DOWNLOAD JBL ES250PW (serv.man2) Service Manual ↓ Size: 3.77 MB | Pages: 56 in PDF or view online for FREE

RST

1

Reset (

Input) - The device enters a low power mode and all internal state machines are reset to 

the default settings when low.  RST should be held low during power-up until the power supply, 
master and left/right clocks are stable. 

SDATA

2

Serial Audio Data (

Input) - Two’s complement MSB-first serial data is input on this pin. The 

data is clocked into SDATA via the serial clock and the channel is determined by the Left/Right 
clock. The required relationship between the Left/Right clock, serial clock and serial data is 
defined by the DIF1-0 pins.  The options are detailed in Figures 16-19.

SCLK

3

Serial Clock (

Input) - Clocks the individual bits of the serial data into the SDATA pin. The 

15

2

14

3

13

4

16

1

11

6

10

7

9

8

12

5

Reset

Mute Control

  Serial Data 

 SDATA

Left Analog Output

Serial Clock / De-emphasis SCLK/DEM1

Analog Power

Left/Right Clock

Analog Ground

Master Clock

Right Analog Output

Digital Interface Format

REF_GND Reference Ground

Digital Interface Format

Quiescent Voltage

De-emphasis

Positive Voltage Reference

36

1/18

November 2004

Reset Circuit

■

PRECISION MONITORING OF 3V, 3.3V, and 
5V SUPPLY VOLTAGES

■

TWO OUTPUT CONFIGURATIONS
–

Push-pull RST Output (STM809/811)

–

Push-pull RST Output (STM810/812)

■

140ms RESET PULSE WIDTH (MIN)

■

LOW SUPPLY CURRENT - 6µA (TYP)

■

GUARANTEED RST/RST ASSERTION 
DOWN TO V

CC

 = 1.0V

■

OPERATING TEMPERATURE:
–40°C to 85°C (Industrial Grade)

■

LEAD-FREE, SMALL SOT23 and SOT143 
PACKAGE

STM809

✔

SOT23-3

STM810

✔

SOT23-3

STM811

✔

✔

SOT143-4

STM812

✔

✔

SOT143-4

SOT23-3 (WX)

SOT143-4 (W1)

37

4/18

The STM809/810/811/812 MICROPROCESSOR
RESET Circuits are low-power supervisory devic-
es used to monitor power supplies. They perform
a single function: asserting a reset signal whenev-
er the V

CC

 supply voltage drops below a preset

value and keeping it asserted until V

CC

 has risen

above the preset threshold for a minimum period
of time (t

rec

). The STM811/812 also provide a

push-button reset input (MR).

Note: 1. For STM810

Note: 1. For STM812

Note: 1. STM810/812 only

2. STM811/812 only

Note: 1. STM811/812 only

2. RST for STM810/812

AI07832

V

CC

STM809/810

V

SS

RST (RST)

(1)

AI07831

V

CC

STM811/812

V

SS

RST (RST)

(1)

MR

V

SS

Ground

RST

Active-Low RESET Output

RST

(1)

Active-High RESET Output

V

CC

Supply Voltage

MR

(2)

Manual Reset Input

AI07833

2

3

1

RST (RST)

V

SS

(For STM810)

V

CC

AI07834

2

4

3

1

RST (RST)

V

SS

(For STM812)

V

CC

MR

AI07835

COMPARE

V

RST

V

CC

DEBOUNCE

t

rec

Generator

MR

(1)

RST

(2)

38

 

 

DO4918 — Squeak 1.5 WHAM2 Preliminary Datasheet (rev. 3.0) 2006-04-06

Page 1 of 47

 

The Squeak 1.5 WHAM2 (Wireless HiFi Audio Module) is a 
highly integrated module package that provides a complete 
solution for wireless audio.  Squeak 1.5, using the Micro Linear 
ML2724 radio transceiver front end and the XInC2 wireless 
processor, is ideal for high performance wireless audio 
applications such as home theater, stereo and outdoor 
speakers, and microphones.  Squeak 1.5 is available in either a 
25 or 50 meter indoor range WHAM2 module. 

The WHAM2 digitizes a 2-channel stereo input signal, sends it 
across a robust 2.4 GHz radio frequency link, and converts the 
signal back to a stereo analog signal for use at a remote 
location.  WHAM2 is also available with a Digital Audio Serial 
Interface (DASI) port that can be configured to interface with 
any SPI supporting device (I

2

S, left- or right-justified), including 

ADCs, DACs, digital audio streams such as S/P-DIF or USB.  A 
development kit is required to modify the DASI port and/or to 
modify application source code firmware.  

•  Analog or Digital Audio Input/Output 
•  48 kHz, 16-bit digital, stereo audio transmission 
•  Digital volume control, manual mute 
•  Auto mute (when signal lost), digital noise gate 
•  2.4 GHz wireless at 1.536 Mbps 
•  Robust Quality of Service (QoS) 
•  Advanced error protection protocols with hardware 

forward error correction, adaptive frequency hopping, and 
walking frequency diversity 

•  25 or 50 meter indoor range 
•  Up to 6 transmitters in specified range area 
•  Low latency; firmware selectable 15 – 64 ms 
•  Duplex utility control channel at 1.5 kbps 
•  Programmable for custom features (with development kit) 

O

RDERING 

I

NFORMATION

 

 

 

TX WH4924 

WH4928 

RX WH4925 

WH4929 

TX WH4926 

WH4930 

RX WH4927 

WH4931 

2-node EV4931 

EV4937 

Add-on node 

EV4933 

EV4939 

Upgrade from any eval. kit 

DK4909 

 

 

39