參數(shù)資料
型號(hào)： LP3971
廠商： National Semiconductor Corporation
英文描述： POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS
中文描述： 電源管理單元提供高級(jí)應(yīng)用處理器
文件頁(yè)數(shù)： 35/42頁(yè)
文件大小： 1350K
代理商： LP3971
LP3971 Controls
(Continued)
GENERAL PURPOSE I/O FUNCTIONALITY (GPIO1 AND
GPIO2)
LP3971 has 2 general purpose I/Os for system control. I
2
C
compatible interface will be used for setting any of the pins to
LP3971 GPIO Control Table
input, output or hi-Z mode. Inputs value can be read via
serial interface (GPI1,2 bits). The pin 29 functionality needs
to
be
set
to
GPIO
by
serial
nEXTCHGEN.
interface
register
bit
Controls
Port Function
GPIO1
Input = 0
Input = 1
X
X
HiZ
Input (dig)-
>
Output = 0
Output= 1
Reg.
gpin 1
0
0
0
batmonchg
Function
Enabled
Not Enabled
GPIO1
<
1
>
X
X
1
X
0
1
0
1
GPIO1
<
0
>
X
X
0
X
0
0
1
1
nextchgen_sel
1
1
1
X
0
0
0
0
bucen
0
o
X
1
X
X
X
X
Enabled
0
Input
0
0
GPIO2
<
1
>
0
1
0
1
GPIO2
<
0
>
0
0
1
1
Factory fm disabled
GPIO_tstiob
1
1
1
1
GPIO2
HiZ
Input (dig)-
>
Output = 0
Output = 1
gpin2
0
Input
0
0
The LP3971 Back Up Charger can be enabled/disabled by
two separate mechanisms. They are; 1) A dedicated control
register bit named BUCEN (Register 0B Bit 2) and 2) GPIO1
input Pin 29, when configured for charger control.
Description of this operation is as follows:
In the default state, the BUCEN bit is not asserted, and
GPIO1 is configured as charger control. High level ap-
plied to GPIO1 will disable the back up charger, Low level
applied to GPIO1 will enable the back up charger. There
is an internal pull up that will disable the back up charger
if GPIO1 is “open”.
If BUCEN bit is asserted with GPIO1 configured for
charger control, the back up charger will always be en-
abled, and GPIO1 input will have no effect.
Configuration of GPIO1 charger function is via control
register bit named BBCS (Register 0E Bit 7). When this
bit is asserted (Default state), GPIO1 is charger control.
When this bit is de-asserted, charger enable is deter-
mined only by the state of control register bit BUCEN.
One additional feature of the charger enable is when the
main battery voltage Vin (Pin 6) is less than the back up
battery voltage Vin BUBATT (Pin 15), The charger will
automatically disable regardless of the input received
from BUCEN or GPIO1.
REGULATED VOLTAGES OK
All the power domains have own register bit (x_OK) that
processor can read via serial interface to be sure that en-
abled powers are OK (regulating). Note that these read only
bits are only valid when regulators are settled (avoid reading
these bits during voltage change or power up).
L
www.national.com
35
相關(guān)PDF資料
PDF描述
LP3971SQ-A514 POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS
LP3971SQ-B410 POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS
LP3971SQX-A514 POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS
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LP3971SQ-A514 制造商:NSC 制造商全稱:National Semiconductor 功能描述:POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS
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