Electronic Components Datasheet Search |
|
TC7129CLW Datasheet(PDF) 10 Page - Microchip Technology |
|
TC7129CLW Datasheet(HTML) 10 Page - Microchip Technology |
10 / 28 page TC7129 DS21459D-page 10 © 2006 Microchip Technology Inc. 4.2.3 +5V Power Supply Measurements are made with respect to power supply ground. COMMON (pin 28) is connected to REF LO (pin 35). A voltage doubler is needed, since the supply voltage is less than the 6V minimum needed by the TC7129. DGND (pin 36) must be isolated from power supply ground (see Figure 4-3). Figure 4-3: Powering the TC7129 From a +5V Power Supply. 4.3 Connecting to External Logic External logic can be directly referenced to DGND (pin 36), provided that the supply current of the external logic does not exceed the sink current of DGND (Figure 4-4). A safe value for DGND sink current is 1.2 mA. If the sink current is expected to exceed this value, a buffer is recommended (see Figure 4-5). Figure 4-4: External Logic Referenced Directly to DGND. Figure 4-5: External Logic Referenced to DGND with Buffer. 4.4 Temperature Compensation For most applications, VDISP (pin 19) can be connected directly to DGND (pin 36). For applications with a wide temperature range, some LCDs require that the drive levels vary with temperature to maintain good viewing angle and display contrast. Figure 4-6 shows two circuits that can be adjusted to give temperature com- pensation of about 10 mV/°C between V+ (pin 24) and VDISP. The diode between DGND and VDISP should have a low turn-on voltage because VDISP cannot exceed 0.3V below DGND. V– V+ DGND + 10 µF + 8 2 4 10 µF + – 3 VIN 5 24 34 35 28 33 32 23 36 TC7660 V+ GND 0.1 µF 0.1 µF +5V TC7129 External Logic DGND V + 36 24 23 ILOGIC TC7129 V- – + External Logic ILOGIC DGND 23 24 V+ 36 TC7129 V– |
Similar Part No. - TC7129CLW |
|
Similar Description - TC7129CLW |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |