MAX11800EWC+T Maxim Integrated Products, MAX11800EWC+T Datasheet - Page 7

IC TOUCH SCREEN CTLR 12-WLP

MAX11800EWC+T

Manufacturer Part Number
MAX11800EWC+T
Description
IC TOUCH SCREEN CTLR 12-WLP
Manufacturer
Maxim Integrated Products
Type
Resistiver
Datasheet

Specifications of MAX11800EWC+T

Touch Panel Interface
4-Wire
Number Of Inputs/keys
1 TSC
Resolution (bits)
12 b
Data Interface
Serial, SPI™
Data Rate/sampling Rate (sps, Bps)
105k
Voltage - Supply
1.7 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
12-WLP
Voltage Supply Source
Single Supply
Sampling Rate (per Second)
105k
Resolution
11 bits
Interface Type
I2C, SPI
Supply Voltage (max)
3.6 V
Supply Voltage (min)
1.7 V
Conversion Rate
34.4 KSPs
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MAX11800EWC+T
MAX11800EWC+TTR
Table 1. Terminology (continued)
Low-Power, Ultra-Small Resistive Touch-Screen
Untimed Scan Untimed Scan: A scan or scan block operation that is controlled by the AP. This only applies to DCM.
Timed Scan
Scan Block
SAR ADC
CORINT
MTAG
TERM
ETAG
APER
CONT
Scan
TIRQ
FIFO
EINT
CINT
TAG
LPM
PUR
PUF
SPI
I
2
C
First-In First-Out Memory: The MAX11800–MAX11803 contain a 1024-bit FIFO that is used to store conversion
results when operating in autonomous conversion mode. FIFO depth indicates the number of words (16-bit
quantity) in the FIFO.
Scan: Generally, a single sequence of operations performed in DCM or ACM. The operations could include a
panel setup operation, followed by a panel measurement operation, or a combined measurement operation.
Scan Block: Generally, a sequence of multiple operations performed in DCM or ACM. The operations could
include panel-setup operations, panel-measurement operations, or combined measurement operations.
Timed Scan: A scan or scan block operation that uses the on-chip oscillator and timer. The timer is controlled
through the configuration registers and represents an array of fixed (time) quantities that are user selectable
(MAX11800/MAX11801).
D a t a Ta g : Infor m ati on ap p end ed to the end of an AD C conver si on r esul t. Tag s i nd i cate the typ e of m easur em ent and
touch status associ ated w i th each p anel ob ser vati on. S ee the d efi ni ti ons for E TAG and M TAG ( al so i n Tab l e 1) .
Event Tag: Data tags indicating the panel touch status observed during a measurement.
Measurement Tag: Data tag indicating the type of measurement read back by the AP (either X, Y, Z1, or Z2).
Touch Interrupt Request: Active-low interrupt, indicating that a touch is present (CINT) or has been initiated
(EINT) in DCM, or that new data is available in the FIFO in ACM.
Edge Interrupt Mode: Indicates, through TIRQ, that a touch has been initiated (EINT) in DCM. The duration that
TIRQ is low is user programmable.
Continuous Interrupt Mode: Indicates, through TIRQ, that a touch is present (CINT) in DCM. TIRQ goes low to
indicate the presence of a touch and stays low until the touch event ceases.
Clear-on-Read Interrupt Mode: Used in ACM only. TIRQ goes low to indicate the presence of new FIFO data. The
interrupt is cleared when the data is read by the AP (MAX11800/MAX11801).
Aperture Mode: Available in ACM only. Reduces data writes to the FIFO by spatially filtering measurement data.
C o n t i n u o u s B i t : An op ti on i n D C M to r etur n the MAX11800–MAX11803 to a p anel setup ( w ai t) m od e ( P S U ) after a
conver si on, r ather than a r etur n to TD M ( r ecom m end ed onl y for ap p l i cati ons w i th ver y l ong p anel settl i ng ti m es and
r eq uest contr ol l i ng thei r ow n aver ag i ng ) . The conti nuous b i t r esi d es i n b i t 0 ( R0) of the P S U and P M C r eg i ster s.
Low-Power Mode: An idle mode used in DCM/EINT or ACM modes, when a touch is detected at the conclusion of
the last measurement. This indicates a new measurement needs to be requested or scheduled (the touch-detect
pullup is not engaged to save power).
Pullup Rough: A fast pullup mode, which uses the main X+ switch in parallel with the on-chip resistive pullup
(50kΩ/100kΩ) to quickly slew the touch panel capacitances. R
Pullup Fine: A slow (fine) pullup mode, which uses the on-chip resistive pullup to slew the touch-panel
capacitances to their final values (R
Successive Approximation Register ADC: An analog-to-digital converter that converts a continuous analog
waveform into a discrete digital representation through a binary search through all possible quantization levels
before finally converging upon a digital output for each conversion.
Inter-Integrated Circuit: A multimaster serial computer bus that is used to attach low-speed peripherals to other
components using two bidirectional open-drain lines, serial data (SDA) and serial clock (SCL), pulled up with
resistors.
Serial Peripheral Interface: A serial interface in which a master device supplies clock pulses to exchange data
serially with a slave over two data wires (master-slave and slave-master).
_______________________________________________________________________________________
Controllers with I
PUF
= 50kΩ or 100kΩ) typical and is required for all applications.
DEFINITION
PUR
≤ 10Ω typical.
2
C/SPI Interface
7

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