 |
Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
|
Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
S-19104N14H-M5T1U Datasheet(PDF) 18 Page - Seiko Instruments Inc |
|
||||||||||||||||||||||||||||||
S-19104N14H-M5T1U Datasheet(HTML) 18 Page - Seiko Instruments Inc |
|
|
18 / 40 page  FOR AUTOMOTIVE 105°C OPERATION BUILT-IN DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING) VOLTAGE DETECTOR WITH SENSE PIN S-19104/19106 Series Rev.1.2_00 18 2. SENSE pin 2. 1 Error when detection voltage is set externally By connecting a node that was resistance-divided by the resistor (RA) and the resistor (RB) to the SENSE pin as seen in Figure 24, the detection voltage can be set externally. For conventional products without the SENSE pin, RA cannot be too large since the resistance-divided node must be connected to the VDD pin. This is because a feed-through current will flow through the VDD pin when it goes from detection to release, and if RA is large, problems such as oscillation or larger error in the hysteresis width may occur. In the S-19104/19106 Series, RA and RB are easily made larger since the resistance-divided node can be connected to the SENSE pin through which no feed-through current flows. However, be careful of error in the current flowing through the internal resistance (RSENSE) that will occur. Although RSENSE in the S-19104/19106 Series is large (4 M Ω min.) to make the error small, RA and RB should be selected such that the error is within the allowable limits. 2. 2 Selection of RA and RB In Figure 24, the relation between the external setting detection voltage (VDX) and the actual detection voltage ( −VDET) is ideally calculated by the equation below. VDX = −VDET × () 1 + RA RB ··· (1) However, in reality there is an error in the current flowing through RSENSE. When considering this error, the relation between VDX and −VDET is calculated as follows. VDX = −VDET × () 1 + RA RB || RSENSE = −VDET × 1 + RA RB × RSENSE RB + RSENSE = −VDET × () 1 + RA RB + RA RSENSE × −VDET ··· (2) By using equations (1) and (2), the error is calculated as −VDET × RA RSENSE . The error rate is calculated as follows by dividing the error by the right-hand side of equation (1). RA × RB RSENSE × (RA + RB) × 100 [%] = RA || RB RSENSE × 100 [%] ··· (3) As seen in equation (3), the smaller the resistance values of RA and RB compared to RSENSE, the smaller the error rate becomes. Also, the relation between the external setting hysteresis width (VHX) and the hysteresis width (VHYS) is calculated by equation below. Error due to RSENSE also occurs to the relation in a similar way to the detection voltage. VHX = VHYS × () 1 + RA RB ··· (4) VSS OUT VDD SENSE RA RB VDX −VDET CD RSENSE Figure 24 Detection Voltage External Setting Circuit Caution If RA and RB are large, the SENSE pin input impedance becomes higher and may cause a malfunction due to noise. In this case, connect a capacitor between the SENSE pin and the VSS pin. |
Número de pieza similar - S-19104N14H-M5T1U |
|
Descripción similar - S-19104N14H-M5T1U |
|
|
Enlace URL |
| Política de Privacidad |
| ALLDATASHEET.ES |
| ¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Spanish ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
