参数资料
型号: 71M6542F-IGT/F
厂商: Maxim Integrated
文件页数: 117/166页
文件大小: 0K
描述: IC ENERGY METERING
标准包装: 90
系列: *
71M6541D/F/G and 71M6542F/G Data Sheet
Name
Location
Rst Wk Dir
Description
Sets the LCD clock frequency. Note: f w = 32768 Hz
LCD_CLK LCD Clock Frequency
LCD_CLK
LCD Clock Frequency
LCD_CLK[1:0]
2400[1:0]
0
R/W
00
f W
2 9
= 64 Hz
10
f W
2 7
= 256 Hz
01
f W
2 8
= 128 Hz
11
f W
2 6
= 512 Hz
The LCD contrast DAC. This DAC controls the VLCD voltage and has an
output range of 2.5 V to 5 V. The VLCD voltage is
LCD_DAC[4:0]
240D[4:0]
0
R/W
VLCD = 2.5 + 2.5 * LCD_DAC[4:0]/ 31
Thus, the LSB of the DAC is 80.6 mV. The maximum DAC output voltage is
limited by V3P3SYS, VBAT, and whether LCD_BSTE = 1.
LCD_E
2400[7]
0
R/W
Enables the LCD display. When disabled, VLC2, VLC1, and VLC0 are
ground as are the COM and SEG outputs if their LCD_MAP bit is 1.
LCD_MAP[55:48]
LCD_MAP[47:40]
LCD_MAP[39:32]
LCD_MAP[31:24]
LCD_MAP[23:16]
LCD_MAP[15:8]
LCD_MAP[7:0]
2405[7:0]
2406[7:0]
2407[7:0]
2408[7:0]
2409[7:0]
240A[7:0]
240B[7:0]
0
0
0
0
0
0
0
R/W Enables LCD segment driver mode of combined SEGDIO pins. Pins that
R/W cannot be configured as outputs (SEG48 through SEG50) become inputs with
R/W internal pull ups when their LCD_MAP bit is zero. Also, note that SEG48
R/W through SEG50 are multiplexed with the in-circuit emulator signals. When the
R/W ICE_E pin is high, the ICE interface is enabled, and SEG48 through SEG50
R/W become E_RXTX, E_TCLK and E_RST, respectively.
R/W
Selects the LCD bias and multiplex mode.
LCD_MODE
Output
LCD_MODE
Output
LCD_MODE[2:0]
2400[6:4]
0
R/W
000
001
4 states, 1/3 bias
3 states, 1/3 bias
100
101
Static display
5 states, 1/3 bias
010
011
2 states, ? bias
3 states, ? bias
110
6 states, 1/3 bias
LCD_ON
LCD_BLANK
240C[0]
240C[1]
0
0
R/W Turns on or off all LCD segments without changing LCD data. If both bits are
R/W set, the LCD display is turned on.
Puts the IC to sleep, but with LCD display still active. Ignored if system power
LCD_ONLY
28B2[6]
0
0
W
is present. It awakens when Wake Timer times out, when certain DIO pins
are raised, or when system power returns. See 3.2 Battery Modes.
LCD_RST
240C[2]
0
R/W
Clear all bits of LCD data. These bits affect SEGDIO pins that are configured
as LCD drivers. This bit does not auto clear.
Rev 4
117
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