ADE7166ASTZF8 Analog Devices Inc, ADE7166ASTZF8 Datasheet - Page 131

• Manufacturer Part Number: ADE7166ASTZF8
• Description: IC ENERGY METER 1PHASE 64LQFP
• Manufacturer: Analog Devices Inc

Specifications of ADE7166ASTZF8

• Applications: Energy Measurement
• Core Processor: 8052
• Program Memory Type: FLASH (8 kB)
• Controller Series: ADE71xx
• Ram Size: 512 x 8
• Interface: I²C, SPI, UART
• Number Of I /o: 20
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Ic Function: Single Phase Energy Measurement IC
• Supply Voltage Range: 3.13V To 3.46V, 2.4V To 3.7V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: LQFP
• No. Of Pins: 64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Because Timer 2 has 16-bit autoreload capability, very low baud
rates are still possible. Timer 2 is selected as the baud rate
generator by setting TCLK and/or RCLK in Timer/Counter 2
control SFR (T2CON, Address 0xC8). The baud rates for transmit
and receive can be simultaneously different. Setting RCLK
and/or TCLK puts Timer 2 into its baud rate generator mode, as
shown in Figure 107.
In this case, the baud rate is given by the following formula:
UART Timer Generated Baud Rates
The high integer dividers in a UART block mean that high speed
baud rates are not always possible. In addition, generating baud
rates requires the exclusive use of a timer, rendering it unusable
for other applications when the UART is required. To address
this problem, each ADE7116/ADE7156/ADE7166/ADE7169/
ADE7566/ADE7569 has a dedicated baud rate timer (UART
timer) specifically for generating highly accurate baud rates. The
UART timer can be used instead of Timer 1 or Timer 2 for gener-
ating very accurate high speed UART baud rates, including
115,200 bps. This timer also allows a much wider range of baud
rates to be obtained. In fact, every desired bit rate from 12 bps
to 393,216 bps can be generated to within an error of ±0.8%. The
UART timer also frees up the other three timers, allowing them
to be used for different applications. A block diagram of the
UART timer is shown in Figure 106.
Mode 1 or Mode 3 Baud Rate =
(
16
×
[
65536
TRANSITION
−
T2EX
DETECTOR
PIN
PIN
(
f
T2
RCAP
NOTE: AVAILABILITY OF ADDITIONAL
EXTERNAL INTERRUPT
CORE
f
CORE
2
H
:
RCAP
C/ T2 = 0
C/ T2 = 1
2
L
)
]
EXEN2
)
CONTROL
CONTROL
ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569
TR2
Figure 107. Timer 2, UART Baud Rates
EXF 2
Rev. B | Page 131 of 152
RCAP2L
(8 BITS)
TL2
TIMER 2
INTERRUPT
RCAP2H
(8 BITS)
TH2
Two SFRs, enhanced serial baud rate control SFR (SBAUDT,
Address 0x9E) and UART timer fractional divider SFR
(SBAUDF, Address 0x9D), are used to control the UART timer.
SBAUDT is the baud rate control SFR; it sets up the integer
divider (DIV) and the extended divider (SBTH) for the UART
timer.
The appropriate value to write to DIV (Bits [2:0]) and SBTH
(Bits [4:3]) bits can be calculated using the following formula
where f
Note that the DIV value must be rounded down to the nearest
integer.
FRACTIONAL
DIVIDER
RELOAD
OVERFLOW
DIV
TIMER 2
CORE
+
is defined in the POWCON SFR (see Table 26).
SBTH
÷(1 + SBAUDF/64)
÷2
Figure 106. UART Timer, UART Baud Rate
f
DIV + SBTH
÷32
CORE
1
1
=
OVERFLOW
2
log
TIMER 1
0
0
0
UART TIMER
Rx/Tx CLOCK
⎛
⎜
⎜
⎝
16
1
×
log
Rx CLOCK
TIMER 1/TIMER 2
RCLK
TCLK
Baud
f
16
16
CORE
( )
2
1
1
SMOD
Rate
Tx CLOCK
0
0
TIMER 1/TIMER 2
Rx
CLOCK
Tx
CLOCK
⎞
⎟
⎟
⎠
UARTBAUDEN
Rx CLOCK
Tx CLOCK