MAX6900 查看數據表（PDF） - Maxim Integrated
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MAX6900 Datasheet PDF : 17 Pages
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I2C-Compatible RTC in a TDFN
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
TIMEKEEPING CURRENT vs. VCC
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VCC (V)
Pin Description
Detailed Description
PIN
NAME
FUNCTION
1
VCC
Power Supply
2
X1
32.768kHz External Crystal
The MAX6900 contains eight timekeeping registers,
burst address registers, a control register, an on-chip
32.768kHz oscillator circuit, and a serial 2-wire, I2C-
compatible interface. There are also 31 bytes, 8 bits
wide of SRAM on board. Time and calendar data are
3
X2
32.768kHz External Crystal
4
GND
Ground
stored in the registers in a binary-coded decimal (BCD)
format. Figure 1 shows an I2C-bus-compatible timing
diagram. Figure 2 shows the MAX6900 functional dia-
5
SCL
I2C-Bus-Compatible Clock Input
gram.
6
SDA
I2C-Bus-Compatible Data
Input/Output
—
PAD
Ground
Real-Time Clock
The RTC provides seconds, minutes, hours, day, date,
month, and year information. The end of the month is
automatically adjusted for months with fewer than 31
START
BIT 7
BIT 6
PROTOCOL
CONDITION
MSB
(A6)
(S)
(A7)
BIT 0
LSB
(R/W)
ACKNOWLEDGE
(A)
STOP
CONDITION
(P)
tSU:STA
SCL
tBUF
SDA
tLOW
tHIGH
1/fSCL
tr
tf
tHD:STA
tHD:DAT
Figure 1. Detailed I2C-Bus Timing Diagrams
tHD:DAT
tSU:STO
4 _______________________________________________________________________________________
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