参数资料
型号: AT85C51SND3B1-RTTUL
厂商: Atmel
文件页数: 33/119页
文件大小: 0K
描述: IC DECODER/ENCODER DGTL 100-LQFP
标准包装: 90
类型: 音频编码器/解码器
应用: 移动电话,手机,视频显示器
电压 - 电源,数字: 1.65 V ~ 3.6 V
安装类型: 表面贴装
封装/外壳: 100-LQFP
供应商设备封装: 100-LQFP(14x14)
包装: 托盘
20
AT85C51SND3B
7632D–MP3–01/07
Schematic
Figure 6. Regulator Connection
Note:
Depending on power supply scheme, CLV may replace CDC capacitor (see Figure 8).
Low Voltage DC-DC in
AT85C51SND3B2
The low voltage output DC-DC converter supplies power to the internal device and
external devices through LVDD power pin. It operates from a single AAA battery. Its
nominal voltage output is 1.8V.
DC-DC Start-Up
DC-DC start-up is done by asserting the DCPWR input until the voltage reaches its
nominal value (see Section “Power Fail Detector”) and firmware starts execution and
sets the DCEN bit in PCON to maintain the DC-DC enabled. DCPWR input can then be
released. As shown in Figure 8 DCPWR input is asserted by pressing a key connected
to BVSS.
Figure 7. DC-DC Start-Up Phase
DC-DC Shut-Down
DC-DC shut-down is done by two different ways:
Clearing the DCEN bit while DCPWR pin is de-asserted
Detecting the presence of an internal or external 3V supply, e.g. when the device is
connected to USB, DC-DC is disabled to save battery power(1).
Note:
1. If DCEN bit is left set, the DC-DC will restart as soon as the USB power supply
disappears.
DC-DC Connection
Figure 8 shows how to connect external components, inductance and components
value along with power characteristics are specified in the section “DC characteristics”.
Figure 8. Battery DC-DC Connection
Note:
Depending on power supply scheme, CDC1 may replace CLV capacitor (see Figure 6).
HVDD
CHV
VSS
RLVDD
CLV
(*)
VSS
DCPWR
DCEN
DC-DC
Start-Up
LVDD
Firmware
Start-Up
DC-DC
On
DC-DC
Off
LVDD
BVDD
BVSS
B
a
tt
e
ry
LDC
DCLI
C
DC1
(*)
VSS
RLVDD
CVSS
C
DC2
DCPWR
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