参数资料
| 型号： | MAX6902ETA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC RTC SPI COMPAT 8-TDFN |
| 标准包装： | 1 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，NVSRAM，Y2K |
| 存储容量： | 31B |
| 时间格式： | HH:MM:SS（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | SPI |
| 电源电压： | 2 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 标准包装 |
| 其它名称： | MAX6902ETA+TDKR |
MAX6902
SPI-Compatible RTC in a TDFN
14
______________________________________________________________________________________
k = parabolic curvature constant (-0.035 ±0.005ppm/°C2
for 32.768kHz watch crystals)
T0 = turnover temperature (+25°C ±5°C for 32.768kHz
watch crystals)
T = temperature of interest (°C)
For example: What is the worst-case change in oscilla-
tor frequency from +25°C ambient to +45°C ambient?
What is the worst-case timekeeping error per second?
Error due to temperature drift:
Error due to 25°C initial crystal tolerance of ±20ppm:
Total timekeeping error per second:
After 1 month that translates to:
Total worst-case timekeeping error at the end of 1
month at 45°C is about 120s or 2min (assumes negligi-
ble parasitic layout capacitance).
Oscillator Start Time
The MAX6902 oscillator typically takes 5s to 10s to
begin oscillating. To ensure the oscillator is operating
correctly, the software should validate proper time-
keeping. This is accomplished by reading the Seconds
register. Any reading of 1s or more from the POR value
of zero seconds is a validation of proper startup.
Δt
day
hr
day
hr
s
=
()
31
24
60
min
(0.000045s/s)
=120.528s
Δ
ΔΔ
Δ
ts
ss
tt
t
ts s
s s
initial
total
drift
initial
total
=
()
[]
{}
=
=+
=+=
1 32 768 0 6
32 768
1 1
0 000020
0 000025
0 000020
0 000045
/,
/
,
/
./
- . 5536
-
ΔΔ
Δ
tf
f
s
fHz
Hz
initial
=+
()
[]
{}
=×
× ×
()=
1
32 768
1
32 768
1 10
0 65536
//
,
/
,(
)
.
-s
-20ppm
-6
ΔΔ
Δ
tf
f
s
tHz
Hz
s
ss
drift
=+
()
[]
{}
=
()
[]
{}
=
1
32 768
1
1 32 768
0
32 768
1
0 000025
//
,
/
/,
/
,
/
./
-s
- .8192
- s
ΔfHz
Hz
drift =×
× ×
×
32 768
1 10
20
0 8192
.(
)
(.
()
-0.04ppm/ C
C - 45 C)
-
2-6
2
=
o
oo
Table 3. 32.768kHz Surface-Mount Watch Crystals
MANUFACTURER
PART NO.
TEMP.
RANGE
CL (pF)
+25
°C
FREQUENCY
TOLERANCE
(ppm)
Abracon Corporation
ABS25-32.768-12.5-B-2-T
-40
°C to +85°C
12.5
±20
Caliber Electronics
AWS2A-32.768KHz, AWS2B-32.768KHz
-20
°C to +70°C
12.5
±20
ECS INC International
ECS-.327-12.5-17
-10
°C to +60°C
12.5
±20
Fox Electronics
FSM327
-40
°C to +85°C
12.5
±20
M-tron
SX2010/ SX2020
-20
°C to +75°C
12.5
±20
Raltron
RSE-32.768-12.5-C-T
-10
°C to +60°C
12.5
±20
SaRonix
32S12A
-40
°C to +85°C
12.5
±20
-200
-250
-100
-150
-50
0
-40
-20
0
20
40
60
80
100
TYPICAL TEMPERATURE CHARACTERISTICS
(k = -0.035 ppm/
°C2; TO = +25°C)
TEMPERATURE (
°C)
f(ppm)
Figure 6. Typical Temperature Curve for 32.768kHz Watch
Crystal
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| MAX6909EO30 | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| MAX6909EO30+ | 功能描述:实时时钟 Integrated Circuits (ICs) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| MAX6909EO30+T | 功能描述:实时时钟 Integrated Circuits (ICs) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| MAX6909EO30-T | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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