參數(shù)資料
型號： ADE7169ACPZF16
廠商： ANALOG DEVICES INC
元件分類： 模擬信號調(diào)理
英文描述： Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver
中文描述： SPECIALTY ANALOG CIRCUIT, QCC64
封裝： 9 X 9 MM, ROHS COMPLIANT, MO-22-VMMD-4, LFCSP-64
文件頁數(shù)： 134/140頁
文件大?。?/td> 1359K
代理商： ADE7169ACPZF16
ADE7169F16
Preliminary Technical Data
I/O PORTS
PARALLEL I/O
The ADE7169F16 uses three input/output ports to exchange
data with external devices. In addition to performing general-
purpose I/O, some are capable of driving an LCD or performing
other alternate functions for the peripheral functions available
on-chip. In general, when a peripheral is enabled, the pins
associated with it cannot be used as a general-purpose I/O. The
I/O port can be configured through the SFRs in Table 133.
Table 133. I/O port SFRs
SFR
Address
Bit
Addressable
Rev. PrD | Page 134 of 140
Description
P0
0x80
Yes
Port 0 register
P1
0x90
Yes
Port 1 register
P2
0xA0
Yes
Port 2 register
EPCFG
0x9F
No
Extended Port
Configuration
PINMAP0
0xB2
No
Port 0 weak pull-up
enable
PINMAP1
0xB3
No
Port 1 weak pull-up
enable
PINMAP2
0xB4
No
Port 2 weak pull-up
enable
The three bidirectional I/O ports have internal pull-ups that can
be enabled or disabled individually for each pin. The internal
pull-ups are enabled by default. Disabling an internal pull-up
causes a pin to become open-drain. Weak internal pull-ups are
configured through PINMAPx SFRs.
READ
LATCH
INTERNAL
BUS
WRITE
TO LATCH
READ
PIN
D
CL
LATCH
Q
DV
DD
Px.x
PIN
INTERNAL
PULL-UP
ALTERNATE
OUTPUT
FUNCTION
ALTERNATE
INPUT
FUNCTION
Q
Closed: PINMAPx.x=0
Open: PINMAPx.x=1
Figure 88. Port 0 Bit Latch and I/O Buffer
Figure 88 shows a typical bit latch and I/O buffer for an I/O pin.
The bit latch (one bit in the port’s SFR) is represented as a Type
D flip-flop, which clocks in a value from the internal bus in
response to a write to latch signal from the CPU. The Q output
of the flip-flop is placed on the internal bus in response to a
read latch signal from the CPU. The level of the port pin itself is
placed on the internal bus in response to a read pin signal from
the CPU. Some instructions that read a port activate the read
latch signal, and others activate the read pin signal. See the
Read-Modify-Write Instructions section for details.
Weak Internal Pullups Enabled
A pin with the weak internal pull-up enabled is used as an input
by writing a 1 is written to the pin. The pin will be pulled high
by the internal pull-ups and the pin will be read using the
circuitry shown in Figure 88. If the pin is driven low externally,
it will source current because of the internal pull-ups.
If used as an output, a pin with an internal pull-up enabled, will
be written with a 1 or a 0 to control the level of the output. If a 0
is written to the pin, it will drive a logic low output voltage
(V
OL
) and is capable of sinking TBD mA.
Open Drain (Weak Internal Pull-ups Disabled)
When the weak internal pull-up on a pin is disabled, the pin
becomes open drain. To use this open-drain pin as a high
impedance input, a 1 is written to the pin. The pin will be read
using the circuitry shown in Figure 88. The open drain option
is preferable for inputs because it draws less current than the
internal pull-ups were enabled.
To use an open-drain pin as a general purpose output, an
external pull-up resistor is required. Open drain outputs are
convenient for changing the voltage to a logic high. The
ADE7169F16 is a 3.3V device so an external resistor pulled up
to 5V may ease interfacing to a 5V IC although most 5V ICs are
tolerant of 3.3V inputs. Pins with 0s written to them drive a
logic low output voltage (V
OL
) and are capable of sinking 1.6 mA.
38 kHz Modulation
The ADE7169F16 provides a 38 kHz modulation signal. The 38
kHz modulation is accomplished by internally XORing the level
written to the MOD38 pin with a 38 kHz square wave. Then
when a zero is written to the MOD38 pin, it is modulated as
shown in Figure 89.
38kHz Modulation Signal
Output at MOD38 Pin
Level written to MOD38
Figure 89: 38 kHz Modulation
Uses for this 38 kHz modulation include IR modulation of a
UART transmit signal or a low power signal to drive a LED. The
modulation can be enabled or disabled with the MOD38EN bit
in the CFG SFR. The 38 kHz modulation is available on eight
pins, selected by the MOD38[7:0] bits in the Extended Port
Configuration SFR (EPCFG, 0x9F).
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