参数资料
| 型号： | X40421V14I-CT1 |
| 厂商： | Intersil |
| 文件页数： | 6/25页 |
| 文件大小： | 0K |
| 描述： | IC VOLT MON DUAL SUP/SW 14-TSSOP |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 2 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 1.6V，2.9V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 带卷 (TR) |
X40420, X40421
Figure 3. V TRIPX Set/Reset Conditions
V TRIPX
(X = 1, 2)
V CC /V2MON
V P
WDO
SCL
0
7
0
7
0
7
SDA
A0h
00h
t WC
Figure 4. Watchdog Restart
The STOP bit following a valid write operation initiates
SCL
.6μs
1.3μs
the programming sequence. Pin WDO must then be
brought LOW to complete the operation.
SDA
Start
WDT Reset
Stop
To check if the V TRIPX has been set, set VXMON to a
value slightly greater than V TRIPX (that was previously
set). Slowly ramp down VXMON and observe when the
corresponding outputs (LOWLINE and V2FAIL) switch.
V1 AND V2 THRESHOLD PROGRAM PROCEDURE
(OPTIONAL)
The X40420, X40421 is shipped with standard V1 and
V2 threshold (V TRIP1, V TRIP2 ) voltages. These values will
not change over normal operating and storage condi-
tions. However, in applications where the standard
thresholds are not exactly right, or if higher precision is
needed in the threshold value, the X40420 trip points
may be adjusted. The procedure is described below, and
uses the application of a high voltage control signal.
Setting a V TRIPx Voltage (x = 1, 2)
There are two procedures used to set the threshold volt-
ages (V TRIPx ), depending if the threshold voltage to be
stored is higher or lower than the present value. For
example, if the present V TRIPx is 2.9 V and the new
V TRIPx is 3.2 V, the new voltage can be stored directly
into the V TRIPx cell. If however, the new setting is to be
lower than the present setting, then it is necessary to
“reset” the V TRIPx voltage before setting the new value.
Setting a Higher V TRIPx Voltage (x = 1, 2)
To set a V TRIPx threshold to a new voltage which is
higher than the present threshold, the user must apply
the desired V TRIPx threshold voltage to the
corresponding input pin (Vcc(V1MON) or V2MON).
Then, a program-ming voltage (Vp) must be applied to
the WDO pin before a START condition is set up on
SDA. Next, issue on the SDA pin the Slave Address A0h,
followed by the Byte Address 01h for V TRIP1 , and 09h for
V TRIP2 , and a 00h Data Byte in order to program V TRIPx .
6
The voltage at which this occurs is the V TRIPX (actual).
C ASE A
Now if the desired V TRIPX is greater than the V TRIPX
(actual), then add the difference between V TRIPX
(desired) - V TRIPX (actual) to the original V TRIPX desired.
This is your new V TRIPX that should be applied to
VXMON and the whole sequence should be repeated
again (see Figure 5).
C ASE B
Now if the V TRIPX (actual), is higher than the V TRIPX
(desired), perform the reset sequence as described in
the next section. The new V TRIPX voltage to be applied
to VXMON will now be: V TRIPX (desired) - (V TRIPX
(actual) - V TRIPX (desired)).
Note: 1. This operation does not corrupt the memory
array.
2. Set V CC = 5V, when V TRIP2 is being pro-
grammed
Setting a Lower V TRIPx Voltage (x = 1, 2)
In order to set V TRIPx to a lower voltage than the
present value, then V TRIPx must first be “reset” accord-
ing to the procedure described in the following section.
Once V TRIPx has been “reset”, then V TRIPx can be set
to the desired voltage using the procedure described
in “Setting a Higher V TRIPx Voltage”.
May 25, 2006
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