参数资料
| 型号： | X40626V14 |
| 厂商： | Intersil |
| 文件页数： | 3/22页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR CPU DUAL 14-TSSOP |
| 标准包装： | 190 |
| 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： | 最小为 100 ms |
| 电压 - 阀值： | 2.93V，4.38V |
| 工作温度： | 0°C ~ 70°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： | 管件 |
X40626
PRINCIPLES OF OPERATION
Power-on Reset
Application of power to the X40626 activates a power-
on Reset Circuit that pulls the RESET pin active. This
signal provides several benefits.
– It prevents the system microprocessor from starting
to operate with insufficient voltage.
– It prevents the processor from operating prior to sta-
bilization of the oscillator.
– It allows time for an FPGA to download its configura-
tion prior to initialization of the circuit.
– It prevents communication to the EEPROM, greatly
reducing the likelihood of data corruption on power-up.
When V CC exceeds the device V TRIP threshold value
for t PURST (200ms nominal) the circuit releases
RESET allowing the system to begin operation.
LOW VOLTAGE MONITORING
During operation, the X40626 monitors the V CC level
and asserts RESET if supply voltage falls below a pre-
set minimum V TRIP . The RESET signal prevents the
microprocessor from operating in a power fail or
brownout condition. The RESET signal remains active
until the voltage drops below 1V. It also remains active
until V CC returns and exceeds V TRIP for 200ms.
WATCHDOG TIMER
The Watchdog Timer circuit monitors the microproces-
sor activity by monitoring the SDA and SCL pins. The
microprocessor must toggle the SDA pin HIGH to
LOW periodically, while SCL is HIGH (this is a start bit)
prior to the expiration of the watchdog time-out period to
prevent a RESET signal. The state of two nonvolatile
control bits in the Status Register determine the watch-
EEPROM INADVERTENT WRITE PROTECTION
When RESET goes active as a result of a low voltage
condition or Watchdog Timer Time-Out, any in-
progress communications are terminated. While
RESET is active, no new communications are allowed
and no non-volatile write operation can start. Non-vol-
atile writes in-progress when RESET goes active are
allowed to finish.
Additional protection mechanisms are provided with
memory Block Lock and the Write Protect (WP) pin.
These are discussed elsewhere in this document.
V CC /V 2MON THRESHOLD RESET PROCEDURE
The X40626 is shipped with a standard V CC threshold
(V TRIP ) voltage. This value will not change over normal
operating and storage conditions. However, in applica-
tions where the standard V TRIP is not exactly right, or if
higher precision is needed in the V TRIP value, the
X40626 threshold may be adjusted. The procedure is
described below, and uses the application of a nonvol-
atile control signal.
Setting the V TRIP Voltage
This procedure is used to set the V TRIP to a higher or
lower voltage value. It is necessary to reset the trip
point before setting the new value.
The V CC and V2MON must be tied together during this
sequence.
To set the new V TRIP voltage, start by setting the WEL
bit in the control register, then apply the desired V TRIP
threshold voltage to the V CC pin and the programming
voltage, V P , to the WP pin and 2 byte address and 1
byte of “00” data. The stop bit following a valid write
operation initiates the V TRIP programming sequence.
Bring WP LOW to complete the operation.
dog timer period. The microprocessor can change
these watchdog bits, or they may be “locked” by tying
the WP pin HIGH.
Figure 1. Set V TRIP Level Sequence (V CC /V 2MON = desired V TRIP values, WP = 12-15V when WEL bit set)
WP
V P = 12-15V
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
SCL
SDA
A0H
00H
xxH*
00H
*for V VTRIP2 address is 0DH
for V TRIP address is 01H
3
FN8119.0
March 28, 2005
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| X40626V14-2.7 | 功能描述:IC SUPERVISOR CPU DUAL 14-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:- 复位:低有效 复位超时:最小为 100 ms 电压 - 阀值:4.38V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
| X40626V14-2.7A | 功能描述:IC SUPERVISOR CPU DUAL 14-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:- 复位:低有效 复位超时:最小为 100 ms 电压 - 阀值:4.38V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
| X40626V14-2.7AT1 | 功能描述:IC SUPERVISOR CPU DUAL 14-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:- 复位:低有效 复位超时:最小为 100 ms 电压 - 阀值:4.38V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
| X40626V14-2.7T1 | 功能描述:IC SUPERVISOR CPU DUAL 14-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:- 复位:低有效 复位超时:最小为 100 ms 电压 - 阀值:4.38V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
| X40626V14-4.5A | 功能描述:IC SUPERVISOR CPU DUAL 14-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:- 复位:低有效 复位超时:最小为 100 ms 电压 - 阀值:4.38V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:8-TSSOP 包装:管件 |
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